feat(v1.4): Add 'Encrypted in memory' badge

docs: update GEMINI.md for v1.4.0 + remove debug logs
chore: small fix in 1.4.0
2026-03-07 09:57:50 +08:00 · 2026-01-30 01:21:28 +08:00 · 2026-01-30 00:44:46 +08:00 · 2026-01-30 00:36:09 +08:00 · 2026-01-30 00:35:00 +08:00 · 2026-01-30 00:08:43 +08:00
22 changed files with 2716 additions and 488 deletions
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -0,0 +1,291 @@
+Here's your `DEVELOPMENT.md`:
+
+```markdown
+# Development Guide - SeedPGP v1.1.0
+
+## Architecture Quick Reference
+
+### Core Types
+
+```typescript
+// src/lib/types.ts
+interface SeedPgpPlaintext {
+  v: number;              // Version (always 1)
+  t: string;              // Type ("bip39")
+  w: string;              // Mnemonic words (normalized)
+  l: string;              // Language ("en")
+  pp: number;             // BIP39 passphrase used? (0 or 1)
+  fpr?: string[];         // Optional recipient fingerprints
+}
+
+interface ParsedSeedPgpFrame {
+  kind: "single";         // Frame type
+  crc16: string;          // 4-digit hex checksum
+  b45: string;            // Base45 payload
+}
+```
+
+### Frame Format
+
+```
+SEEDPGP1:0:ABCD:BASE45DATA
+
+SEEDPGP1 - Protocol identifier + version
+0        - Frame number (single frame)
+ABCD     - CRC16-CCITT-FALSE checksum (4 hex digits)
+BASE45   - Base45-encoded PGP binary message
+```
+
+### Key Functions
+
+#### Encryption Flow
+```typescript
+buildPlaintext(mnemonic, bip39PassphraseUsed, recipientFingerprints?)
+  → SeedPgpPlaintext
+
+encryptToSeedPgp({ plaintext, publicKeyArmored?, messagePassword? })
+  → { framed: string, pgpBytes: Uint8Array, recipientFingerprint?: string }
+```
+
+#### Decryption Flow
+```typescript
+decryptSeedPgp({ frameText, privateKeyArmored?, privateKeyPassphrase?, messagePassword? })
+  → SeedPgpPlaintext
+
+frameDecodeToPgpBytes(frameText)
+  → Uint8Array (with CRC16 validation)
+```
+
+#### Encoding/Decoding
+```typescript
+frameEncode(pgpBinary: Uint8Array) → "SEEDPGP1:0:CRC16:BASE45"
+frameParse(text: string) → ParsedSeedPgpFrame
+frameDecodeToPgpBytes(frameText: string) → Uint8Array
+```
+
+### Dependencies
+
+```json
+{
+  "openpgp": "^6.3.0",      // PGP encryption (curve25519Legacy)
+  "bun-types": "latest",    // Bun runtime types
+  "react": "^18.x",         // UI framework
+  "vite": "^5.x"            // Build tool
+}
+```
+
+### OpenPGP.js v6 Quirks
+
+⚠️ **Important compatibility notes:**
+
+1. **Empty password array bug**: Never pass `passwords: []` to `decrypt()`. Only include if non-empty:
+   ```typescript
+   if (msgPw) {
+     decryptOptions.passwords = [msgPw];
+   }
+   ```
+
+2. **Curve naming**: Use `curve25519Legacy` (not `curve25519`) in `generateKey()`
+
+3. **Key validation**: Always call `getEncryptionKey()` to verify public key has usable subkeys
+
+## Project Structure
+
+```
+seedpgp-web/
+├── src/
+│   ├── lib/
+│   │   ├── seedpgp.ts        # Core encrypt/decrypt logic
+│   │   ├── seedpgp.test.ts   # Test vectors (15 tests)
+│   │   ├── base45.ts         # Base45 encoder/decoder
+│   │   ├── crc16.ts          # CRC16-CCITT-FALSE
+│   │   └── types.ts          # TypeScript interfaces
+│   ├── App.tsx               # React UI entry
+│   └── main.tsx              # Vite bootstrap
+├── package.json
+├── tsconfig.json
+├── vite.config.ts
+├── README.md
+└── DEVELOPMENT.md            # This file
+```
+
+## Development Workflow
+
+### Running Tests
+
+```bash
+# All tests
+bun test
+
+# Watch mode
+bun test --watch
+
+# Verbose output
+bun test --verbose
+```
+
+### Development Server
+
+```bash
+bun run dev          # Start Vite dev server
+bun run build        # Production build
+bun run preview      # Preview production build
+```
+
+### Adding Features
+
+1. **Write tests first** in `seedpgp.test.ts`
+2. **Implement in** `src/lib/seedpgp.ts`
+3. **Update types** in `types.ts` if needed
+4. **Run full test suite**: `bun test`
+5. **Commit with conventional commits**: `feat: add QR generation`
+
+## Feature Agenda
+
+### 🚧 v1.2.0 - QR Code Round-Trip
+
+**Goal**: Read back QR code and decrypt with user-provided credentials
+
+**Tasks**:
+- [ ] Add QR code generation from `encrypted.framed`
+  - Library: `qrcode` or `qr-code-styling`
+  - Input: SEEDPGP1 frame string
+  - Output: QR code image/canvas/SVG
+  
+- [ ] Add QR code scanner UI
+  - Library: `html5-qrcode` or `jsqr`
+  - Camera/file upload input
+  - Parse scanned text → `frameText`
+  
+- [ ] Build decrypt UI form
+  - Input fields:
+    - Scanned QR text (auto-filled)
+    - Private key (file upload or paste)
+    - Key passphrase (password input)
+    - OR message password (alternative)
+  - Call `decryptSeedPgp()`
+  - Display recovered mnemonic + metadata
+  
+- [ ] Add visual feedback
+  - CRC16 validation status
+  - Key fingerprint match indicator
+  - Decryption success/error states
+
+**API Usage**:
+```typescript
+// Generate QR
+import QRCode from 'qrcode';
+const { framed } = await encryptToSeedPgp({ ... });
+const qrDataUrl = await QRCode.toDataURL(framed);
+
+// Scan and decrypt
+const scannedText = "SEEDPGP1:0:ABCD:..."; // from scanner
+const decrypted = await decryptSeedPgp({
+  frameText: scannedText,
+  privateKeyArmored: userKey,
+  privateKeyPassphrase: userPassword,
+});
+console.log(decrypted.w); // Recovered mnemonic
+```
+
+**Security Notes**:
+- Never log decrypted mnemonics in production
+- Clear sensitive data from memory after use
+- Validate CRC16 before attempting decrypt
+- Show key fingerprint for user verification
+
+---
+
+### 🔮 Future Ideas (v1.3+)
+
+- [ ] Multi-frame support (for larger payloads)
+- [ ] Password-only (SKESK) encryption flow
+- [ ] Shamir Secret Sharing integration
+- [ ] Hardware wallet key generation
+- [ ] Mobile companion app (React Native)
+- [ ] Printable paper backup templates
+- [ ] Encrypted cloud backup with PBKDF2
+- [ ] BIP85 child mnemonic derivation
+
+## Debugging Tips
+
+### Enable verbose PGP logging
+
+Uncomment in `seedpgp.ts`:
+```typescript
+console.log("Raw PGP hex:", Array.from(pgpBytes).map(...));
+console.log("SeedPGP: message packets:", ...);
+console.log("SeedPGP: encryption key IDs:", ...);
+```
+
+### Test with known vectors
+
+Use Trezor vectors from test file:
+```bash
+bun test "Trezor"  # Run only Trezor tests
+```
+
+### Validate frame manually
+
+```typescript
+import { frameParse } from "./lib/seedpgp";
+const parsed = frameParse("SEEDPGP1:0:ABCD:...");
+console.log(parsed); // Check structure
+```
+
+## Code Style
+
+- **Functions**: Async by default, explicit return types
+- **Errors**: Throw descriptive Error objects with context
+- **Naming**: `camelCase` for functions, `PascalCase` for types
+- **Comments**: Only for non-obvious crypto/encoding logic
+- **Testing**: One test per edge case, descriptive names
+
+## Git Workflow
+
+```bash
+# Feature branch
+git checkout -b feat/qr-generation
+
+# Conventional commits
+git commit -m "feat(qr): add QR code generation"
+git commit -m "test(qr): add QR round-trip test"
+
+# Tag releases
+git tag -a v1.2.0 -m "Release v1.2.0 - QR round-trip"
+git push origin main --tags
+```
+
+## Questions for Next Session
+
+When continuing development, provide:
+
+1. **Feature context**: "Adding QR code generation for v1.2.0"
+2. **Current code**: Paste relevant files you're modifying
+3. **Specific question**: "How should I structure the QR scanner component?"
+
+Example starter prompt:
+```
+I'm working on seedpgp-web v1.1.0 (BIP39 PGP encryption tool).
+
+[Paste this DEVELOPMENT.md section]
+[Paste relevant source files]
+
+I want to add QR code generation. Here's my current seedpgp.ts...
+```
+
+---
+
+**Last Updated**: 2026-01-28  
+**Maintainer**: @kccleoc
+```
+
+Now commit it:
+
+```bash
+git add DEVELOPMENT.md
+git commit -m "docs: add development guide with v1.2.0 QR agenda"
+git push origin main
+```
+
+Ready for your next feature sprint! 🚀📋
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -0,0 +1,378 @@
+# SeedPGP - Gemini Code Assist Project Brief
+
+## Project Overview
+
+**SeedPGP v1.3.0**: Client-side BIP39 mnemonic encryption webapp  
+**Stack**: Bun + Vite + React + TypeScript + OpenPGP.js + Tailwind CSS  
+**Deploy**: GitHub Pages (public repo: `seedpgp-web-app`, private source: `seedpgp-web`)  
+**Live URL**: <https://kccleoc.github.io/seedpgp-web-app/>
+
+## Core Constraints
+
+1. **Security-first**: Never persist secrets (mnemonic/passphrase/private keys) to localStorage/sessionStorage/IndexedDB
+2. **Small PRs**: Max 1-5 files per feature; propose plan before coding
+3. **Client-side only**: No backend; all crypto runs in browser (Web Crypto API + OpenPGP.js)
+4. **GitHub Pages deploy**: Base path `/seedpgp-web-app/` configured in vite.config.ts
+5. **Honest security claims**: Don't overclaim what client-side JS can guarantee
+
+## Non-Negotiables
+
+- Small diffs only: one feature slice per PR (1-5 files if possible)
+- No big code dumps; propose plan first, then implement
+- Never persist secrets to browser storage
+- Prefer "explain what you found in the repo" over guessing
+- TypeScript strict mode; no `any` types without justification
+
+---
+
+## Architecture Map
+
+### Entry Points
+
+- `src/main.tsx` → `src/App.tsx` (main application)
+- Build output: `dist/` (separate git repo for GitHub Pages deployment)
+
+### Directory Structure
+
+```BASH
+src/
+├── components/        # React UI components
+│   ├── PgpKeyInput.tsx
+│   ├── QrDisplay.tsx
+│   ├── QrScanner.tsx
+│   ├── ReadOnly.tsx
+│   ├── StorageIndicator.tsx
+│   ├── SecurityWarnings.tsx
+│   └── ClipboardTracker.tsx
+├── lib/              # Core logic & crypto utilities
+│   ├── seedpgp.ts    # Main encrypt/decrypt functions
+│   ├── sessionCrypto.ts  # Ephemeral AES-GCM session keys
+│   ├── types.ts      # TypeScript interfaces
+│   └── qr.ts         # QR code utilities
+├── App.tsx           # Main app component
+└── main.tsx          # React entry point
+```
+
+### Key Modules
+
+#### `src/lib/seedpgp.ts`
+
+Core encryption/decryption:
+
+- `encryptToSeedPgp()` - Encrypts mnemonic with PGP public key + optional password
+- `decryptFromSeedPgp()` - Decrypts with PGP private key + optional password
+- Uses OpenPGP.js for PGP operations
+- Output format: `SEEDPGP1:version:base64data:fingerprint`
+
+#### `src/lib/sessionCrypto.ts` (v1.3.0+)
+
+Ephemeral session-key encryption:
+
+- `getSessionKey()` - Generates/returns non-exportable AES-GCM-256 key (idempotent)
+- `encryptJsonToBlob(obj)` - Encrypts to `{v, alg, iv_b64, ct_b64}`
+- `decryptBlobToJson(blob)` - Decrypts back to original object
+- `destroySessionKey()` - Drops key reference for garbage collection
+- Test: `await window.runSessionCryptoTest()` (DEV only)
+
+#### `src/lib/types.ts`
+
+Core interfaces:
+
+- `SeedPgpPlaintext` - Decrypted mnemonic data structure
+- `SeedPgpCiphertext` - Encrypted payload structure
+- `EncryptedBlob` - Session-key encrypted cache format
+
+---
+
+## Key Features
+
+### v1.0 - Core Functionality
+
+- **Backup**: Encrypt mnemonic with PGP public key + optional password → QR display
+- **Restore**: Scan/paste QR → decrypt with private key → show mnemonic
+- **PGP support**: Import public/private keys (.asc files or paste)
+
+### v1.1 - QR Features
+
+- **QR Display**: Generate QR codes from encrypted data
+- **QR Scanner**: Camera + file upload (uses html5-qrcode library)
+
+### v1.2 - Security Monitoring
+
+- **Storage Indicator**: Real-time display of localStorage/sessionStorage contents
+- **Security Warnings**: Context-aware alerts about browser memory limitations
+- **Clipboard Tracker**: Monitor clipboard operations on sensitive fields
+- **Read-only Mode**: Toggle to clear state + show CSP/build info
+
+### v1.3-v1.4 - Session-Key Encryption
+
+- **Ephemeral encryption**: AES-GCM-256 session key (non-exportable) encrypts sensitive state
+- **Backup flow (v1.3)**: Mnemonic auto-clears immediately after QR generation
+- **Restore flow (v1.4)**: Decrypted mnemonic auto-clears after 10 seconds + manual Hide button
+- **Encrypted cache**: Only ciphertext stored in React state; key lives in memory only
+- **Lock/Clear**: Manual cleanup destroys session key + clears all state
+- **Lifecycle**: Session key auto-destroyed on page close/refresh
+
+---
+
+## Development Workflow
+
+### Commands
+
+```bash
+bun install           # Install dependencies
+bun run dev           # Dev server (localhost:5173)
+bun run build         # Build to dist/
+bun run typecheck     # TypeScript validation (tsc --noEmit)
+bun run preview       # Preview production build
+./scripts/deploy.sh v1.x.x  # Build + push to public repo
+```
+
+### Deployment Process
+
+1. **Private repo** (`seedpgp-web`): Source code, development
+2. **Public repo** (`seedpgp-web-app`): Built files for GitHub Pages
+3. **Deploy script** (`scripts/deploy.sh`): Builds + copies to dist/ + pushes to public repo
+
+### Git Workflow
+
+```bash
+# Commit feature
+git add src/
+git commit -m "feat(v1.x): description"
+
+# Tag version
+git tag v1.x.x
+git push origin main --tags
+
+# Deploy to GitHub Pages
+./scripts/deploy.sh v1.x.x
+```
+
+---
+
+## Required Workflow for AI Agents
+
+### 1. Study First
+
+Before implementing any feature:
+
+- Read relevant files
+- Explain current architecture + entry points
+- List files that will be touched
+- Identify potential conflicts or dependencies
+
+### 2. Plan
+
+- Propose smallest vertical slice (1-5 files)
+- Show API signatures or interface changes first
+- Get approval before generating full implementation
+
+### 3. Implement
+
+- Generate code with TypeScript strict mode
+- Include JSDoc comments for public APIs
+- Show unified diffs, not full file rewrites (when possible)
+- Keep changes under 50-100 lines per file when feasible
+
+### 4. Verify
+
+- Run `bun run typecheck` - no errors
+- Run `bun run build` - successful dist/ output
+- Provide manual test steps for browser verification
+- Show build output / console logs / DevTools screenshots
+
+---
+
+## Common Patterns
+
+### State Management
+
+- React `useState` + `useEffect` (no Redux/Zustand/external store)
+- Ephemeral state only; avoid persistent storage for secrets
+
+### Styling
+
+- Tailwind utility classes (configured in `tailwind.config.js`)
+- Responsive design: mobile-first with `md:` breakpoints
+- Dark theme primary: slate-900 background, blue-400 accents
+
+### Icons
+
+- `lucide-react` library
+- Common: Shield, QrCode, Lock, Eye, AlertCircle
+
+### Crypto Operations
+
+- **PGP**: OpenPGP.js (`openpgp` package)
+- **Session keys**: Web Crypto API (`crypto.subtle`)
+- **Key generation**: `crypto.subtle.generateKey()` with `extractable: false`
+- **Encryption**: AES-GCM with random 12-byte IV per operation
+
+### Type Safety
+
+- Strict TypeScript (`tsconfig.json`: `strict: true`)
+- Check `src/lib/types.ts` for core interfaces
+- Avoid `any`; use `unknown` + type guards when necessary
+
+---
+
+## Security Architecture
+
+### Threat Model (Honest)
+
+**What we protect against:**
+
+- Accidental persistence to localStorage/sessionStorage
+- Plaintext secrets lingering in React state after use
+- Clipboard history exposure (with warnings)
+
+**What we DON'T protect against (and must not claim to):**
+
+- Active XSS or malicious browser extensions
+- Memory dumps or browser crash reports
+- JavaScript garbage collection timing (non-deterministic)
+
+### Memory Handling
+
+- **Session keys**: Non-exportable CryptoKey objects (Web Crypto API)
+- **Plaintext clearing**: Set to empty string + drop references (but GC timing is non-deterministic)
+- **No guarantees**: Cannot force immediate memory wiping in JavaScript
+
+### Storage Policy
+
+- **NEVER write to**: localStorage, sessionStorage, IndexedDB, cookies
+- **Exception**: Non-sensitive UI state only (theme preferences, etc.) - NOT IMPLEMENTED YET
+- **Verification**: StorageIndicator component monitors all storage APIs
+
+---
+
+## What NOT to Do
+
+### Code Generation
+
+- Don't generate full file rewrites unless necessary
+- Don't add dependencies without discussing bundle size impact
+- Don't use `any` types without explicit justification
+- Don't skip TypeScript strict mode checks
+
+### Security Claims
+
+- Don't claim "RAM is wiped" (JavaScript can't force GC)
+- Don't claim "offline mode" without real CSP headers (GitHub Pages can't set custom headers)
+- Don't promise protection against active browser compromise (XSS/extensions)
+
+### Storage
+
+- Don't write secrets to storage without explicit approval
+- Don't cache decrypted data beyond immediate use
+- Don't assume browser storage is secure
+
+---
+
+## Testing & Verification
+
+### Manual Test Checklist (Before Marking Feature Complete)
+
+1. ✅ `bun run typecheck` passes (no TypeScript errors)
+2. ✅ `bun run build` succeeds (dist/ generated)
+3. ✅ Browser test: Feature works as described
+4. ✅ DevTools Console: No runtime errors
+5. ✅ DevTools Application tab: No plaintext secrets in storage
+6. ✅ DevTools Network tab: No unexpected network calls (if Read-only Mode)
+
+### Session-Key Encryption Test (v1.3+)
+
+```javascript
+// In browser DevTools console:
+await window.runSessionCryptoTest()
+// Expected: ✅ Success: Data integrity verified.
+```
+
+---
+
+## Current Version: v1.4.0
+
+### Recent Changes (2026-01-30)
+- ✅ Extended session-key encryption to Restore flow
+- ✅ Added 10-second auto-clear timer for restored mnemonic
+- ✅ Added Hide button for manual clear
+- ✅ Removed debug console logs from sessionCrypto.ts
+
+### Known Limitations
+
+- GitHub Pages cannot set custom CSP headers (need Cloudflare Pages for enforcement)
+- Read-only Mode is UI-level only (not browser-enforced)
+- Session-key encryption doesn't protect against active XSS/extensions
+
+### Next Priorities (Suggested)
+
+1. Extend session-key encryption to Restore flow
+2. Migrate to Cloudflare Pages for real CSP header enforcement
+3. Add "Encrypted in memory" badge when encryptedMnemonicCache exists
+4. Document reproducible builds (git hash verification)
+
+---
+
+## Quick Reference
+
+### File a Bug/Feature
+
+1. Describe expected vs actual behavior
+2. Include browser console errors (if any)
+3. Specify which flow (Backup/Restore/QR Scanner)
+
+### Roll Over to Next Session
+
+Always provide:
+
+- Current version number
+- What was implemented this session
+- Files modified
+- What still needs work
+- Any gotchas or edge cases discovered
+
+---
+
+## Example Prompts for Gemini
+
+### Exploration
+
+```
+Read GEMINI.md, then explain:
+1. Where is the mnemonic textarea and how is its value managed?
+2. List all places localStorage/sessionStorage are used
+3. Show data flow from "Backup" button to QR display
+```
+
+### Feature Request
+
+```
+Task: [Feature description]
+
+Requirements:
+1. [Specific requirement]
+2. [Another requirement]
+
+Files to touch:
+- [List files]
+
+Plan first: show proposed API/changes before generating code.
+```
+
+### Verification
+
+```
+Audit the codebase to verify [feature] is fully implemented.
+Check:
+1. [Requirement 1]
+2. [Requirement 2]
+Output: ✅ or ❌ for each item + suggest fixes for failures.
+```
+
+
+---
+
+**Last Updated**: 2026-01-29  
+**Maintained by**: @kccleoc  
+**AI Agent**: Optimized for Gemini Code Assist
--- a/README.md
+++ b/README.md
@@ -1,73 +1,366 @@
-# React + TypeScript + Vite
+# SeedPGP v1.1.0

-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+**Secure BIP39 mnemonic backup using PGP encryption and QR codes**

-Currently, two official plugins are available:
+A TypeScript/Bun tool for encrypting cryptocurrency seed phrases with OpenPGP and encoding them as QR-friendly Base45 frames with CRC16 integrity checking.

- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) (or [oxc](https://oxc.rs) when used in [rolldown-vite](https://vite.dev/guide/rolldown)) for Fast Refresh
- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+## Features

-## React Compiler
+- 🔐 **PGP Encryption**: Uses cv25519 (Curve25519) for modern elliptic curve cryptography
+- 📱 **QR Code Ready**: Base45 encoding optimized for QR code generation
+- ✅ **Integrity Checking**: CRC16-CCITT-FALSE checksums prevent corruption
+- 🔑 **BIP39 Support**: Full support for 12/18/24-word mnemonics with passphrase indicator
+- 🧪 **Battle-Tested**: Validated against official Trezor BIP39 test vectors
+- ⚡ **Fast**: Built with Bun runtime for optimal performance

-The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
+## Installation

-## Expanding the ESLint configuration
+```bash
+# Clone repository
+git clone https://github.com/kccleoc/seedpgp-web.git
+cd seedpgp-web

-If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
+# Install dependencies
+bun install

-```js
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
+# Run tests
+bun test

-      // Remove tseslint.configs.recommended and replace with this
-      tseslint.configs.recommendedTypeChecked,
-      // Alternatively, use this for stricter rules
-      tseslint.configs.strictTypeChecked,
-      // Optionally, add this for stylistic rules
-      tseslint.configs.stylisticTypeChecked,
-
-      // Other configs...
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
+# Start development server
+bun run dev
 ```

-You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+## Usage

-```js
-// eslint.config.js
-import reactX from 'eslint-plugin-react-x'
-import reactDom from 'eslint-plugin-react-dom'
+### Encrypt a Mnemonic

-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-      // Enable lint rules for React
-      reactX.configs['recommended-typescript'],
-      // Enable lint rules for React DOM
-      reactDom.configs.recommended,
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
+```typescript
+import { encryptToSeedPgp, buildPlaintext } from "./lib/seedpgp";
+
+const mnemonic = "legal winner thank year wave sausage worth useful legal winner thank yellow";
+const plaintext = buildPlaintext(mnemonic, false); // false = no BIP39 passphrase used
+
+const result = await encryptToSeedPgp({
+  plaintext,
+  publicKeyArmored: yourPgpPublicKey,
+});
+
+console.log(result.framed); // SEEDPGP1:0:ABCD:BASE45DATA...
+console.log(result.recipientFingerprint); // Key fingerprint for verification
+```
+
+### Decrypt a SeedPGP Frame
+
+```typescript
+import { decryptSeedPgp } from "./lib/seedpgp";
+
+const decrypted = await decryptSeedPgp({
+  frameText: "SEEDPGP1:0:ABCD:BASE45DATA...",
+  privateKeyArmored: yourPrivateKey,
+  privateKeyPassphrase: "your-key-password",
+});
+
+console.log(decrypted.w); // Recovered mnemonic
+console.log(decrypted.pp); // BIP39 passphrase indicator (0 or 1)
+```
+
+## Deployment to GitHub Pages (FREE)
+
+This project uses a two-repository setup to keep source code private while hosting the app for free.
+
+### One-Time Setup
+
+#### 1. Create Public Deployment Repo
+
+Go to https://github.com/new and create:
+- **Name**: `seedpgp-web-app` (or any name you prefer)
+- **Visibility**: **Public**
+- **Don't** initialize with README, .gitignore, or license
+
+#### 2. Configure Vite Base Path
+
+Edit `vite.config.ts`:
+
+```typescript
+export default defineConfig({
+  plugins: [react()],
+  base: '/seedpgp-web-app/', // Match your public repo name
+})
+```
+
+#### 3. Build and Deploy
+
+```bash
+# Build the production bundle
+bun run build
+
+# Initialize git in dist folder
+cd dist
+git init
+git add .
+git commit -m "Deploy seedpgp v1.1.0"
+
+# Push to your public repo
+git remote add origin https://github.com/kccleoc/seedpgp-web-app.git
+git branch -M main
+git push -u origin main
+
+# Return to project root
+cd ..
+```
+
+#### 4. Enable GitHub Pages
+
+1. Go to `https://github.com/kccleoc/seedpgp-web-app/settings/pages`
+2. **Source**: Deploy from a branch
+3. **Branch**: Select `main` → `/` (root)
+4. Click **Save**
+
+Wait 1-2 minutes, then visit: **https://kccleoc.github.io/seedpgp-web-app/**
+
+---
+
+### Deploying Updates (v1.2.0, v1.3.0, etc.)
+
+Create `scripts/deploy.sh` in your project root:
+
+```bash
+#!/bin/bash
+set -e
+
+VERSION=$1
+
+if [ -z "$VERSION" ]; then
+  echo "Usage: ./scripts/deploy.sh v1.2.0"
+  exit 1
+fi
+
+echo "🔨 Building $VERSION..."
+bun run build
+
+echo "📦 Deploying to GitHub Pages..."
+cd dist
+git add .
+git commit -m "Deploy $VERSION" || echo "No changes to commit"
+git push
+
+cd ..
+echo "✅ Deployed to https://kccleoc.github.io/seedpgp-web-app/"
+echo "🏷️  Don't forget to tag: git tag $VERSION && git push --tags"
+```
+
+Make executable and use:
+
+```bash
+chmod +x scripts/deploy.sh
+./scripts/deploy.sh v1.2.0
+```
+
+---
+
+### Repository Structure
+
+- **seedpgp-web** (Private) - Your source code, active development
+- **seedpgp-web-app** (Public) - Built files only, served via GitHub Pages
+
+**Cost: $0/month** ✅
+
+## Frame Format
+
+```
+SEEDPGP1:FRAME:CRC16:BASE45DATA
+
+SEEDPGP1 - Protocol identifier and version
+0        - Frame number (0 = single frame)
+ABCD     - 4-digit hex CRC16-CCITT-FALSE checksum
+BASE45   - Base45-encoded PGP message
+```
+
+## API Reference
+
+### `buildPlaintext(mnemonic, bip39PassphraseUsed, recipientFingerprints?)`
+
+Creates a SeedPGP plaintext object.
+
+**Parameters:**
+- `mnemonic` (string): BIP39 mnemonic phrase (12/18/24 words)
+- `bip39PassphraseUsed` (boolean): Whether a BIP39 passphrase was used
+- `recipientFingerprints` (string[]): Optional array of recipient key fingerprints
+
+**Returns:** `SeedPgpPlaintext` object
+
+### `encryptToSeedPgp(params)`
+
+Encrypts a plaintext object to SeedPGP format.
+
+**Parameters:**
+```typescript
+{
+  plaintext: SeedPgpPlaintext;
+  publicKeyArmored?: string;      // PGP public key (PKESK)
+  messagePassword?: string;        // Symmetric password (SKESK)
+}
+```
+
+**Returns:**
+```typescript
+{
+  framed: string;                  // SEEDPGP1 frame
+  pgpBytes: Uint8Array;            // Raw PGP message
+  recipientFingerprint?: string;   // Key fingerprint
+}
+```
+
+### `decryptSeedPgp(params)`
+
+Decrypts a SeedPGP frame.
+
+**Parameters:**
+```typescript
+{
+  frameText: string;                // SEEDPGP1 frame
+  privateKeyArmored?: string;       // PGP private key
+  privateKeyPassphrase?: string;    // Key unlock password
+  messagePassword?: string;         // SKESK password
+}
+```
+
+**Returns:** `SeedPgpPlaintext` object
+
+## Testing
+
+```bash
+# Run all tests
+bun test
+
+# Run with verbose output
+bun test --verbose
+
+# Watch mode (auto-rerun on changes)
+bun test --watch
+```
+
+### Test Coverage
+
+- ✅ 15 comprehensive tests
+- ✅ 8 official Trezor BIP39 test vectors
+- ✅ Edge cases (wrong key, wrong passphrase)
+- ✅ Frame format validation
+- ✅ CRC16 integrity checking
+
+## Security Considerations
+
+### ✅ Best Practices
+
+- Uses **AES-256** for symmetric encryption
+- **cv25519** provides ~128-bit security level
+- **CRC16** detects QR scan errors (not cryptographic)
+- Key fingerprint validation prevents wrong-key usage
+
+### ⚠️ Important Notes
+
+- **Never share your private key or encrypted QR codes publicly**
+- Store backup QR codes in secure physical locations (safe, safety deposit box)
+- Use a strong PGP key passphrase (20+ characters)
+- Test decryption immediately after generating backups
+- Consider password-only (SKESK) encryption as additional fallback
+
+### 🔒 Production Deployment Warning
+
+The GitHub Pages deployment at **https://kccleoc.github.io/seedpgp-web-app/** is for:
+- ✅ Testing and demonstration
+- ✅ Convenient access for personal use
+- ⚠️ Always verify the URL before use
+
+For maximum security with real funds:
+- Run locally: `bun run dev`
+- Or self-host on your own domain with HTTPS
+
+## Project Structure
+
+```
+seedpgp-web/
+├── src/
+│   ├── lib/
+│   │   ├── seedpgp.ts        # Core encryption/decryption
+│   │   ├── seedpgp.test.ts   # Test vectors
+│   │   ├── base45.ts         # Base45 codec
+│   │   ├── crc16.ts          # CRC16-CCITT-FALSE
+│   │   └── types.ts          # TypeScript definitions
+│   └── App.tsx               # React UI
+├── scripts/
+│   └── deploy.sh             # Deployment automation
+├── package.json
+├── DEVELOPMENT.md            # Development guide
+└── README.md                 # This file
+```
+
+## Tech Stack
+
+- **Runtime**: [Bun](https://bun.sh) v1.3.6+
+- **Language**: TypeScript
+- **Crypto**: [OpenPGP.js](https://openpgpjs.org) v6.3.0
+- **Framework**: React + Vite
+- **Testing**: Bun test runner
+
+## Roadmap
+
+- [ ] QR code generation UI
+- [ ] QR code scanner with camera support
+- [ ] Multi-frame support for larger payloads
+- [ ] Hardware wallet integration
+- [ ] Mobile scanning app
+- [ ] Shamir Secret Sharing support
+
+## License
+
+MIT License - see LICENSE file for details
+
+## Author
+
+**kccleoc** - [GitHub](https://github.com/kccleoc)
+
+## Version History
+
+### v1.1.0 (2026-01-28)
+- Initial public release
+- Full BIP39 mnemonic support
+- Trezor test vector validation
+- Production-ready implementation
+- GitHub Pages deployment guide
+
+---
+
+⚠️ **Disclaimer**: This software is provided as-is. Always test thoroughly before trusting with real funds. The author is not responsible for lost funds due to software bugs or user error.
+
+Now create the deployment script:
+
+```bash
+mkdir -p scripts
+cat > scripts/deploy.sh << 'EOF'
+#!/bin/bash
+set -e
+
+VERSION=$1
+
+if [ -z "$VERSION" ]; then
+  echo "Usage: ./scripts/deploy.sh v1.2.0"
+  exit 1
+fi
+
+echo "🔨 Building $VERSION..."
+bun run build
+
+echo "📦 Deploying to GitHub Pages..."
+cd dist
+git add .
+git commit -m "Deploy $VERSION" || echo "No changes to commit"
+git push
+
+cd ..
+echo "✅ Deployed to https://kccleoc.github.io/seedpgp-web-app/"
+echo "🏷️  Don't forget to tag: git tag $VERSION && git push --tags"
+EOF
+
+chmod +x scripts/deploy.sh
 ```
--- a/_GPT-Suggestion.md
+++ b/_GPT-Suggestion.md
@@ -1,10 +0,0 @@
-Next steps (optional):
-QR code generation - Add library to generate QR codes from encrypted.framed
-
-UI integration - Connect to your React components
-
-Multi-frame support - If you need to handle larger payloads (though mnemonics fit in single frame)
-
-Password-only mode - Test SKESK-only encryption for backup scenarios
-
-Your crypto wallet backup tool has a solid foundation! 🔐✨
--- a/bun.lock
+++ b/bun.lock
@@ -5,6 +5,7 @@
    "": {
      "name": "seedpgp-web",
      "dependencies": {
+        "html5-qrcode": "^2.3.8",
        "lucide-react": "^0.462.0",
        "openpgp": "^6.3.0",
        "qrcode": "^1.5.4",
@@ -195,7 +196,7 @@

    "@types/babel__traverse": ["@types/babel__traverse@7.28.0", "", { "dependencies": { "@babel/types": "^7.28.2" } }, "sha512-8PvcXf70gTDZBgt9ptxJ8elBeBjcLOAcOtoO/mPJjtji1+CdGbHgm77om1GrsPxsiE+uXIpNSK64UYaIwQXd4Q=="],

-    "@types/bun": ["@types/bun@1.3.6", "", { "dependencies": { "bun-types": "1.3.6" } }, "sha512-uWCv6FO/8LcpREhenN1d1b6fcspAB+cefwD7uti8C8VffIv0Um08TKMn98FynpTiU38+y2dUO55T11NgDt8VAA=="],
+    "@types/bun": ["@types/bun@1.3.7", "", { "dependencies": { "bun-types": "1.3.7" } }, "sha512-lmNuMda+Z9b7tmhA0tohwy8ZWFSnmQm1UDWXtH5r9F7wZCfkeO3Jx7wKQ1EOiKq43yHts7ky6r8SDJQWRNupkA=="],

    "@types/estree": ["@types/estree@1.0.8", "", {}, "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w=="],

@@ -223,7 +224,7 @@

    "autoprefixer": ["autoprefixer@10.4.23", "", { "dependencies": { "browserslist": "^4.28.1", "caniuse-lite": "^1.0.30001760", "fraction.js": "^5.3.4", "picocolors": "^1.1.1", "postcss-value-parser": "^4.2.0" }, "peerDependencies": { "postcss": "^8.1.0" }, "bin": { "autoprefixer": "bin/autoprefixer" } }, "sha512-YYTXSFulfwytnjAPlw8QHncHJmlvFKtczb8InXaAx9Q0LbfDnfEYDE55omerIJKihhmU61Ft+cAOSzQVaBUmeA=="],

-    "baseline-browser-mapping": ["baseline-browser-mapping@2.9.18", "", { "bin": { "baseline-browser-mapping": "dist/cli.js" } }, "sha512-e23vBV1ZLfjb9apvfPk4rHVu2ry6RIr2Wfs+O324okSidrX7pTAnEJPCh/O5BtRlr7QtZI7ktOP3vsqr7Z5XoA=="],
+    "baseline-browser-mapping": ["baseline-browser-mapping@2.9.19", "", { "bin": { "baseline-browser-mapping": "dist/cli.js" } }, "sha512-ipDqC8FrAl/76p2SSWKSI+H9tFwm7vYqXQrItCuiVPt26Km0jS+NzSsBWAaBusvSbQcfJG+JitdMm+wZAgTYqg=="],

    "binary-extensions": ["binary-extensions@2.3.0", "", {}, "sha512-Ceh+7ox5qe7LJuLHoY0feh3pHuUDHAcRUeyL2VYghZwfpkNIy/+8Ocg0a3UuSoYzavmylwuLWQOf3hl0jjMMIw=="],

@@ -231,7 +232,7 @@

    "browserslist": ["browserslist@4.28.1", "", { "dependencies": { "baseline-browser-mapping": "^2.9.0", "caniuse-lite": "^1.0.30001759", "electron-to-chromium": "^1.5.263", "node-releases": "^2.0.27", "update-browserslist-db": "^1.2.0" }, "bin": { "browserslist": "cli.js" } }, "sha512-ZC5Bd0LgJXgwGqUknZY/vkUQ04r8NXnJZ3yYi4vDmSiZmC/pdSN0NbNRPxZpbtO4uAfDUAFffO8IZoM3Gj8IkA=="],

-    "bun-types": ["bun-types@1.3.6", "", { "dependencies": { "@types/node": "*" } }, "sha512-OlFwHcnNV99r//9v5IIOgQ9Uk37gZqrNMCcqEaExdkVq3Avwqok1bJFmvGMCkCE0FqzdY8VMOZpfpR3lwI+CsQ=="],
+    "bun-types": ["bun-types@1.3.7", "", { "dependencies": { "@types/node": "*" } }, "sha512-qyschsA03Qz+gou+apt6HNl6HnI+sJJLL4wLDke4iugsE6584CMupOtTY1n+2YC9nGVrEKUlTs99jjRLKgWnjQ=="],

    "camelcase": ["camelcase@5.3.1", "", {}, "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg=="],

@@ -297,6 +298,8 @@

    "hasown": ["hasown@2.0.2", "", { "dependencies": { "function-bind": "^1.1.2" } }, "sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ=="],

+    "html5-qrcode": ["html5-qrcode@2.3.8", "", {}, "sha512-jsr4vafJhwoLVEDW3n1KvPnCCXWaQfRng0/EEYk1vNcQGcG/htAdhJX0be8YyqMoSz7+hZvOZSTAepsabiuhiQ=="],
+
    "is-binary-path": ["is-binary-path@2.1.0", "", { "dependencies": { "binary-extensions": "^2.0.0" } }, "sha512-ZMERYes6pDydyuGidse7OsHxtbI7WVeUEozgR/g7rd0xUimYNlvZRE/K2MgZTjWy725IfelLeVcEM97mmtRGXw=="],

    "is-core-module": ["is-core-module@2.16.1", "", { "dependencies": { "hasown": "^2.0.2" } }, "sha512-UfoeMA6fIJ8wTYFEUjelnaGI67v6+N7qXJEvQuIGa99l4xsCruSYOVSQ0uPANn4dAzm8lkYPaKLrrijLq7x23w=="],
@@ -459,12 +462,8 @@

    "yargs-parser": ["yargs-parser@18.1.3", "", { "dependencies": { "camelcase": "^5.0.0", "decamelize": "^1.2.0" } }, "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ=="],

-    "@types/qrcode/@types/node": ["@types/node@24.10.9", "", { "dependencies": { "undici-types": "~7.16.0" } }, "sha512-ne4A0IpG3+2ETuREInjPNhUGis1SFjv1d5asp8MzEAGtOZeTeHVDOYqOgqfhvseqg/iXty2hjBf1zAOb7RNiNw=="],
-
    "anymatch/picomatch": ["picomatch@2.3.1", "", {}, "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA=="],

-    "bun-types/@types/node": ["@types/node@24.10.9", "", { "dependencies": { "undici-types": "~7.16.0" } }, "sha512-ne4A0IpG3+2ETuREInjPNhUGis1SFjv1d5asp8MzEAGtOZeTeHVDOYqOgqfhvseqg/iXty2hjBf1zAOb7RNiNw=="],
-
    "chokidar/glob-parent": ["glob-parent@5.1.2", "", { "dependencies": { "is-glob": "^4.0.1" } }, "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow=="],

    "fast-glob/glob-parent": ["glob-parent@5.1.2", "", { "dependencies": { "is-glob": "^4.0.1" } }, "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow=="],
@@ -472,9 +471,5 @@
    "micromatch/picomatch": ["picomatch@2.3.1", "", {}, "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA=="],

    "readdirp/picomatch": ["picomatch@2.3.1", "", {}, "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA=="],
-
-    "@types/qrcode/@types/node/undici-types": ["undici-types@7.16.0", "", {}, "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw=="],
-
-    "bun-types/@types/node/undici-types": ["undici-types@7.16.0", "", {}, "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw=="],
  }
 }
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
 <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>SeedPGP v1.1</title>
+  <title>SeedPGP v1.4</title>
 </head>

 <body>
--- a/package.json
+++ b/package.json
@@ -1,14 +1,16 @@
 {
  "name": "seedpgp-web",
  "private": true,
-  "version": "1.1.0",
+  "version": "1.4.0",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "typecheck": "tsc --noEmit"
  },
  "dependencies": {
+    "html5-qrcode": "^2.3.8",
    "lucide-react": "^0.462.0",
    "openpgp": "^6.3.0",
    "qrcode": "^1.5.4",
--- a/public/README.md
+++ b/public/README.md
@@ -0,0 +1,121 @@
+# SeedPGP Web App
+
+**Secure BIP39 mnemonic backup tool using OpenPGP encryption**
+
+🔗 **Live App**: https://kccleoc.github.io/seedpgp-web-app/
+
+## About
+
+Client-side web application for encrypting cryptocurrency seed phrases (BIP39 mnemonics) using OpenPGP encryption with QR code generation and scanning capabilities.
+
+### ✨ Features
+
+- 🔐 **OpenPGP Encryption** - Curve25519Legacy (cv25519) encryption
+- 📱 **QR Code Generation** - High-quality 512x512px PNG with download
+- 📸 **QR Code Scanner** - Camera or image upload with live preview
+- 🔄 **Round-trip Flow** - Encrypt → QR → Scan → Decrypt seamlessly
+- ✅ **BIP39 Support** - 12/18/24-word mnemonics with optional passphrase
+- 🔒 **Symmetric Encryption** - Optional password-only encryption (SKESK)
+- 🎯 **CRC16 Validation** - Frame integrity checking
+- 📦 **Base45 Encoding** - Compact QR-friendly format (RFC 9285)
+- 🌐 **100% Client-Side** - No backend, no data transmission
+
+## 🔒 Security Notice
+
+⚠️ **Your private keys and seed phrases never leave your browser**
+
+- Static web app with **no backend server**
+- All cryptographic operations run **locally in your browser**
+- **No data transmitted** to any server
+- Camera access requires **HTTPS or localhost**
+- Always verify you're on the correct URL before use
+
+### For Maximum Security
+
+For production use with real funds:
+- 🏠 Download and run locally (\`bun run dev\`)
+- 🔐 Use on airgapped device
+- 📥 Self-host on your own domain
+- 🔍 Source code: https://github.com/kccleoc/seedpgp-web (private)
+
+## 📖 How to Use
+
+### Backup Flow
+1. **Enter** your 12/24-word BIP39 mnemonic
+2. **Add** PGP public key and/or message password (optional)
+3. **Generate** encrypted QR code
+4. **Download** or scan QR code for backup
+
+### Restore Flow
+1. **Scan QR Code** using camera or upload image
+2. **Provide** private key and/or message password
+3. **Decrypt** to recover your mnemonic
+
+### QR Scanner Features
+- 📷 **Camera Mode** - Live scanning with environment camera (iPhone Continuity Camera supported on macOS)
+- 📁 **Upload Mode** - Scan from saved images or screenshots
+- ✅ **Auto-validation** - Verifies SEEDPGP1 format before accepting
+
+## 🛠 Technical Stack
+
+- **TypeScript** - Type-safe development
+- **React 18** - Modern UI framework
+- **Vite 6** - Lightning-fast build tool
+- **OpenPGP.js v6** - RFC 4880 compliant encryption
+- **html5-qrcode** - QR scanning library
+- **TailwindCSS** - Utility-first styling
+- **Lucide React** - Beautiful icons
+
+## 📋 Protocol Format
+
+\`\`\`
+SEEDPGP1:0:ABCD:BASE45DATA
+
+SEEDPGP1 - Protocol identifier + version
+0        - Frame number (single frame)
+ABCD     - CRC16-CCITT-FALSE checksum
+BASE45   - Base45-encoded OpenPGP binary message
+\`\`\`
+
+## 🔐 Encryption Details
+
+- **Algorithm**: AES-256 (preferred symmetric cipher)
+- **Curve**: Curve25519Legacy for modern security
+- **Key Format**: OpenPGP RFC 4880 compliant
+- **Error Correction**: QR Level M (15% recovery)
+- **Integrity**: CRC16-CCITT-FALSE frame validation
+
+## 📱 Browser Compatibility
+
+- ✅ Chrome/Edge (latest)
+- ✅ Safari 16+ (macOS/iOS)
+- ✅ Firefox (latest)
+- 📷 Camera requires HTTPS or localhost
+
+## 📦 Version
+
+**Current deployment: v1.2.0**
+
+### Changelog
+
+#### v1.2.0 (2026-01-29)
+- ✨ Added QR scanner with camera/upload support
+- 📥 Added QR code download with auto-naming
+- 🔧 Split state for backup/restore tabs
+- 🎨 Improved QR generation quality
+- 🐛 Fixed Safari camera permissions
+- 📱 Added Continuity Camera support
+
+#### v1.1.0 (2026-01-28)
+- 🎉 Initial public release
+- 🔐 OpenPGP encryption/decryption
+- 📱 QR code generation
+- ✅ BIP39 validation
+
+---
+
+**Last updated**: 2026-01-29
+
+**Built with** ❤️ using TypeScript, React, Vite, and OpenPGP.js
+
+**License**: Private source code - deployment only
--- a/scripts/deploy.sh
+++ b/scripts/deploy.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -e
+
+VERSION=$1
+
+if [ -z "$VERSION" ]; then
+  echo "Usage: ./scripts/deploy.sh v1.2.0"
+  exit 1
+fi
+
+echo "🔨 Building $VERSION..."
+# Remove old build files but keep .git
+rm -rf dist/assets dist/index.html dist/*.js dist/*.css dist/vite.svg
+
+bun run build
+
+echo "📄 Adding README..."
+if [ -f public/README.md ]; then
+  cp public/README.md dist/README.md
+fi
+
+echo "📦 Deploying to GitHub Pages..."
+cd dist
+
+git add .
+git commit -m "Deploy $VERSION" || echo "No changes to commit"
+git push
+
+cd ..
+
+echo "✅ Deployed to https://kccleoc.github.io/seedpgp-web-app/"
+echo ""
+echo "Tag private repo:"
+echo "  git tag $VERSION && git push origin --tags"
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,405 +1,540 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import {
  Shield,
  QrCode,
  RefreshCw,
-  CheckCircle2,
+  CheckCircle2, Lock,
  AlertCircle,
-  Lock,
  Unlock,
-  Eye,
  EyeOff,
  FileKey,
-  Info
+  Info,
+  WifiOff
 } from 'lucide-react';
 import { PgpKeyInput } from './components/PgpKeyInput';
 import { QrDisplay } from './components/QrDisplay';
+import QRScanner from './components/QRScanner';
 import { validateBip39Mnemonic } from './lib/bip39';
 import { buildPlaintext, encryptToSeedPgp, decryptSeedPgp } from './lib/seedpgp';
-import type { SeedPgpPlaintext } from './lib/types';
 import * as openpgp from 'openpgp';
-console.log("OpenPGP.js version:", openpgp.config.versionString);
-
-function App() {
-  const [activeTab, setActiveTab] = useState<'backup' | 'restore'>('backup');
-  const [mnemonic, setMnemonic] = useState('');
-  const [messagePassword, setMessagePassword] = useState('');
-  const [pgpKeyInput, setPgpKeyInput] = useState('');
-  const [privateKeyPassphrase, setPrivateKeyPassphrase] = useState('');
-  const [hasBip39Passphrase, setHasBip39Passphrase] = useState(false);
-  const [qrPayload, setQrPayload] = useState('');
-  const [recipientFpr, setRecipientFpr] = useState('');
-  const [restoreInput, setRestoreInput] = useState('');
-  const [restoredData, setRestoredData] = useState<SeedPgpPlaintext | null>(null);
-  const [error, setError] = useState('');
-  const [loading, setLoading] = useState(false);
-  const [showMnemonic, setShowMnemonic] = useState(false);
-  const [copied, setCopied] = useState(false);
-
-  const copyToClipboard = async (text: string) => {
-    try {
-      await navigator.clipboard.writeText(text);
-      setCopied(true);
-      window.setTimeout(() => setCopied(false), 1500);
-    } catch {
-      // Fallback for environments where Clipboard API is blocked
-      const ta = document.createElement("textarea");
-      ta.value = text;
-      ta.style.position = "fixed";
-      ta.style.left = "-9999px";
-      document.body.appendChild(ta);
-      ta.focus();
-      ta.select();
-      document.execCommand("copy");
-      document.body.removeChild(ta);
-      setCopied(true);
-      window.setTimeout(() => setCopied(false), 1500);
-    }
-  };
-
-
-  const handleBackup = async () => {
-    setLoading(true);
-    setError('');
-    setQrPayload('');
-    setRecipientFpr('');
-
-    try {
-      const validation = validateBip39Mnemonic(mnemonic);
-      if (!validation.valid) {
-        throw new Error(validation.error);
-      }
-
-      const plaintext = buildPlaintext(mnemonic, hasBip39Passphrase);
-
-      const result = await encryptToSeedPgp({
-        plaintext,
-        publicKeyArmored: pgpKeyInput || undefined,
-        messagePassword: messagePassword || undefined,
-      });
-
-      setQrPayload(result.framed);
-      if (result.recipientFingerprint) {
-        setRecipientFpr(result.recipientFingerprint);
-      }
-    } catch (e) {
-      setError(e instanceof Error ? e.message : 'Encryption failed');
-    } finally {
-      setLoading(false);
-    }
-  };
-
-  const handleRestore = async () => {
-    setLoading(true);
-    setError('');
-    setRestoredData(null);
-
-    try {
-      const result = await decryptSeedPgp({
-        frameText: restoreInput,
-        privateKeyArmored: pgpKeyInput || undefined,
-        privateKeyPassphrase: privateKeyPassphrase || undefined,
-        messagePassword: messagePassword || undefined,
-      });
-
-      setRestoredData(result);
-    } catch (e) {
-      setError(e instanceof Error ? e.message : 'Decryption failed');
-    } finally {
-      setLoading(false);
-    }
-  };
-
-  return (
-    <div className="min-h-screen bg-gradient-to-br from-slate-50 to-slate-100 text-slate-900 p-4 md:p-8">
-      <div className="max-w-5xl mx-auto bg-white rounded-2xl shadow-2xl overflow-hidden border border-slate-200">
-
-        {/* Header */}
-        <div className="bg-gradient-to-r from-slate-900 to-slate-800 p-6 text-white flex items-center justify-between">
-          <div className="flex items-center gap-3">
-            <div className="p-2 bg-blue-600 rounded-lg shadow-lg">
-              <Shield size={28} />
-            </div>
-            <div>
-              <h1 className="text-2xl font-bold tracking-tight">
-                SeedPGP <span className="text-blue-400 font-mono text-base ml-2">v1.1</span>
-              </h1>
-              <p className="text-xs text-slate-400 mt-0.5">OpenPGP-secured BIP39 backup</p>
-            </div>
-          </div>
-          <div className="flex bg-slate-800/50 rounded-lg p-1 backdrop-blur">
-            <button
-              onClick={() => {
-                setActiveTab('backup');
-                setError('');
-                setQrPayload('');
-                setRestoredData(null);
-              }}
-              className={`px-5 py-2 rounded-md text-sm font-semibold transition-all ${activeTab === 'backup'
-                ? 'bg-white text-slate-900 shadow-lg'
-                : 'text-slate-300 hover:text-white hover:bg-slate-700/50'
-                }`}
-            >
-              Backup
-            </button>
-            <button
-              onClick={() => {
-                setActiveTab('restore');
-                setError('');
-                setQrPayload('');
-                setRestoredData(null);
-              }}
-              className={`px-5 py-2 rounded-md text-sm font-semibold transition-all ${activeTab === 'restore'
-                ? 'bg-white text-slate-900 shadow-lg'
-                : 'text-slate-300 hover:text-white hover:bg-slate-700/50'
-                }`}
-            >
-              Restore
-            </button>
-          </div>
-        </div>
-
-        <div className="p-6 md:p-8 space-y-6">
-          {/* Error Display */}
-          {error && (
-            <div className="p-4 bg-red-50 border-l-4 border-red-500 rounded-r-xl flex gap-3 text-red-800 text-sm items-start animate-in slide-in-from-top-2">
-              <AlertCircle className="shrink-0 mt-0.5" size={20} />
-              <div>
-                <p className="font-bold mb-1">Error</p>
-                <p className="whitespace-pre-wrap">{error}</p>
-              </div>
-            </div>
-          )}
-
-          {/* Info Banner */}
-          {recipientFpr && activeTab === 'backup' && (
-            <div className="p-3 bg-blue-50 border border-blue-200 rounded-lg flex items-start gap-3 text-blue-800 text-xs animate-in fade-in">
-              <Info size={16} className="shrink-0 mt-0.5" />
-              <div>
-                <strong>Recipient Key:</strong> <code className="bg-blue-100 px-1.5 py-0.5 rounded font-mono">{recipientFpr}</code>
-              </div>
-            </div>
-          )}
-
-          {/* Main Content Grid */}
-          <div className="grid gap-6 md:grid-cols-3">
-            <div className="md:col-span-2 space-y-6">
-              {activeTab === 'backup' ? (
-                <>
-                  <div className="space-y-2">
-                    <label className="text-sm font-semibold text-slate-700">BIP39 Mnemonic</label>
-                    <textarea
-                      className="w-full h-32 p-4 bg-slate-50 border border-slate-200 rounded-xl text-sm font-mono focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all resize-none"
-                      placeholder="Enter your 12 or 24 word seed phrase..."
-                      value={mnemonic}
-                      onChange={(e) => setMnemonic(e.target.value)}
-                    />
-                  </div>
-
-                  <PgpKeyInput
-                    label="PGP Public Key (Optional)"
-                    icon={FileKey}
-                    placeholder="-----BEGIN PGP PUBLIC KEY BLOCK-----&#10;&#10;Paste or drag & drop your public key..."
-                    value={pgpKeyInput}
-                    onChange={setPgpKeyInput}
-                  />
-                </>
-              ) : (
-                <>
-                  <div className="space-y-2">
-                    <label className="text-sm font-semibold text-slate-700">SEEDPGP1 Payload</label>
-                    <textarea
-                      className="w-full h-32 p-4 bg-slate-50 border border-slate-200 rounded-xl text-xs font-mono focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all resize-none"
-                      placeholder="SEEDPGP1:0:ABCD:..."
-                      value={restoreInput}
-                      onChange={(e) => setRestoreInput(e.target.value)}
-                    />
-                  </div>
-
-                  <PgpKeyInput
-                    label="PGP Private Key (Optional)"
-                    icon={FileKey}
-                    placeholder="-----BEGIN PGP PRIVATE KEY BLOCK-----&#10;&#10;Paste or drag & drop your private key..."
-                    value={pgpKeyInput}
-                    onChange={setPgpKeyInput}
-                  />
-
-                  {pgpKeyInput && (
-                    <div className="space-y-2">
-                      <label className="text-xs font-bold text-slate-500 uppercase tracking-wider">Private Key Passphrase</label>
-                      <div className="relative">
-                        <Lock className="absolute left-3 top-3 text-slate-400" size={16} />
-                        <input
-                          type="password"
-                          className="w-full pl-10 pr-4 py-2.5 bg-white border border-slate-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all"
-                          placeholder="Unlock private key..."
-                          value={privateKeyPassphrase}
-                          onChange={(e) => setPrivateKeyPassphrase(e.target.value)}
-                        />
-                      </div>
-                    </div>
-                  )}
-                </>
-              )}
-            </div>
-
-            {/* Security Panel */}
-            <div className="space-y-6">
-              <div className="p-5 bg-gradient-to-br from-slate-50 to-slate-100 rounded-2xl border-2 border-slate-200 shadow-inner space-y-4">
-                <h3 className="text-sm font-bold text-slate-800 uppercase tracking-wider flex items-center gap-2">
-                  <Lock size={14} /> Security Options
-                </h3>
-
-                <div className="space-y-2">
-                  <label className="text-xs font-bold text-slate-500 uppercase tracking-wider">Message Password</label>
-                  <div className="relative">
-                    <Lock className="absolute left-3 top-3 text-slate-400" size={16} />
-                    <input
-                      type="password"
-                      className="w-full pl-10 pr-4 py-2.5 bg-white border border-slate-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all"
-                      placeholder="Optional password..."
-                      value={messagePassword}
-                      onChange={(e) => setMessagePassword(e.target.value)}
-                    />
-                  </div>
-                  <p className="text-[10px] text-slate-500 mt-1">Symmetric encryption password (SKESK)</p>
-                </div>
-
-                {activeTab === 'backup' && (
-                  <div className="pt-3 border-t border-slate-300">
-                    <label className="flex items-center gap-2 cursor-pointer group">
-                      <input
-                        type="checkbox"
-                        checked={hasBip39Passphrase}
-                        onChange={(e) => setHasBip39Passphrase(e.target.checked)}
-                        className="rounded text-blue-600 focus:ring-2 focus:ring-blue-500 transition-all"
-                      />
-                      <span className="text-xs font-medium text-slate-700 group-hover:text-slate-900 transition-colors">
-                        BIP39 25th word active
-                      </span>
-                    </label>
-                  </div>
-                )}
-              </div>
-
-              {/* Action Button */}
-              {activeTab === 'backup' ? (
-                <button
-                  onClick={handleBackup}
-                  disabled={!mnemonic || loading}
-                  className="w-full py-4 bg-gradient-to-r from-blue-600 to-blue-700 text-white rounded-xl font-bold flex items-center justify-center gap-2 hover:from-blue-700 hover:to-blue-800 transition-all shadow-lg hover:shadow-xl disabled:opacity-50 disabled:cursor-not-allowed disabled:hover:from-blue-600 disabled:hover:to-blue-700"
-                >
-                  {loading ? (
-                    <RefreshCw className="animate-spin" size={20} />
-                  ) : (
-                    <QrCode size={20} />
-                  )}
-                  {loading ? 'Generating...' : 'Generate QR Backup'}
-                </button>
-              ) : (
-                <button
-                  onClick={handleRestore}
-                  disabled={!restoreInput || loading}
-                  className="w-full py-4 bg-gradient-to-r from-slate-800 to-slate-900 text-white rounded-xl font-bold flex items-center justify-center gap-2 hover:from-slate-900 hover:to-black transition-all shadow-lg hover:shadow-xl disabled:opacity-50 disabled:cursor-not-allowed"
-                >
-                  {loading ? (
-                    <RefreshCw className="animate-spin" size={20} />
-                  ) : (
-                    <Unlock size={20} />
-                  )}
-                  {loading ? 'Decrypting...' : 'Decrypt & Restore'}
-                </button>
-              )}
-            </div>
-          </div>
-
-          {/* QR Output */}
-          {qrPayload && activeTab === 'backup' && (
-            <div className="pt-6 border-t border-slate-200 space-y-6 animate-in fade-in slide-in-from-bottom-4">
-              <div className="flex justify-center">
-                <QrDisplay value={qrPayload} />
-              </div>
-              <div className="space-y-2">
-                <div className="flex items-center justify-between gap-3">
-                  <label className="text-xs font-bold text-slate-500 uppercase tracking-wider">
-                    Raw payload (copy for backup)
-                  </label>
-
-                  <button
-                    type="button"
-                    onClick={() => copyToClipboard(qrPayload)}
-                    className="inline-flex items-center gap-2 px-3 py-1.5 rounded-lg bg-slate-900 text-white text-xs font-semibold hover:bg-black transition-colors"
-                  >
-                    {copied ? <CheckCircle2 size={14} /> : <QrCode size={14} />}
-                    {copied ? "Copied" : "Copy"}
-                  </button>
-                </div>
-
-                <textarea
-                  readOnly
-                  value={qrPayload}
-                  onFocus={(e) => e.currentTarget.select()}
-                  className="w-full h-28 p-3 bg-slate-900 rounded-xl font-mono text-[10px] text-green-400 border border-slate-700 shadow-inner leading-relaxed resize-none focus:outline-none focus:ring-2 focus:ring-blue-500"
-                />
-                <p className="text-[11px] text-slate-500">
-                  Tip: click the box to select all, or use Copy.
-                </p>
-              </div>
-
-            </div>
-          )}
-
-          {/* Restored Mnemonic */}
-          {restoredData && activeTab === 'restore' && (
-            <div className="pt-6 border-t border-slate-200 animate-in zoom-in-95">
-              <div className="p-6 bg-gradient-to-br from-green-50 to-emerald-50 border-2 border-green-300 rounded-2xl shadow-lg">
-                <div className="flex items-center justify-between mb-4">
-                  <span className="font-bold text-green-700 flex items-center gap-2 text-lg">
-                    <CheckCircle2 size={22} /> Mnemonic Recovered
-                  </span>
-                  <button
-                    onClick={() => setShowMnemonic(!showMnemonic)}
-                    className="p-2.5 hover:bg-green-100 rounded-xl transition-all text-green-700 hover:shadow"
-                  >
-                    {showMnemonic ? <EyeOff size={22} /> : <Eye size={22} />}
-                  </button>
-                </div>
-
-                <div className={`p-6 bg-white rounded-xl border-2 border-green-200 shadow-sm transition-all duration-300 ${showMnemonic ? 'blur-0' : 'blur-lg select-none'
-                  }`}>
-                  <p className="font-mono text-center text-lg text-slate-800 tracking-wide leading-relaxed break-words">
-                    {restoredData.w}
-                  </p>
-                </div>
-
-                {restoredData.pp === 1 && (
-                  <div className="mt-4 p-3 bg-orange-100 border border-orange-300 rounded-lg">
-                    <p className="text-xs text-center text-orange-800 font-bold uppercase tracking-widest flex items-center justify-center gap-2">
-                      <AlertCircle size={14} /> BIP39 Passphrase Required (25th Word)
-                    </p>
-                  </div>
-                )}
-
-                {restoredData.fpr && restoredData.fpr.length > 0 && (
-                  <div className="mt-4 p-3 bg-blue-50 border border-blue-200 rounded-lg">
-                    <p className="text-xs text-blue-800">
-                      <strong>Encrypted for keys:</strong> {restoredData.fpr.join(', ')}
-                    </p>
-                  </div>
-                )}
-              </div>
-            </div>
-          )}
-        </div>
-      </div>
-
-      {/* Footer */}
-      <div className="mt-8 text-center text-xs text-slate-500">
-        <p>SeedPGP v1.1 • OpenPGP (RFC 4880) + Base45 (RFC 9285) + CRC16/CCITT-FALSE</p>
-        <p className="mt-1">Never share your private keys or seed phrases. Always verify on an airgapped device.</p>
-      </div>
-    </div>
-  );
-}
-
-export default App;
+import { StorageIndicator } from './components/StorageIndicator';
+import { SecurityWarnings } from './components/SecurityWarnings';
+import { ClipboardTracker } from './components/ClipboardTracker';
+import { ReadOnly } from './components/ReadOnly';
+import { getSessionKey, encryptJsonToBlob, destroySessionKey, EncryptedBlob } from './lib/sessionCrypto';
+ 
+ console.log("OpenPGP.js version:", openpgp.config.versionString);
+ 
+ function App() {
+   const [activeTab, setActiveTab] = useState<'backup' | 'restore'>('backup');
+   const [mnemonic, setMnemonic] = useState('');
+   const [backupMessagePassword, setBackupMessagePassword] = useState('');
+   const [restoreMessagePassword, setRestoreMessagePassword] = useState('');
+ 
+   const [publicKeyInput, setPublicKeyInput] = useState('');
+   const [privateKeyInput, setPrivateKeyInput] = useState('');
+   const [privateKeyPassphrase, setPrivateKeyPassphrase] = useState('');
+   const [hasBip39Passphrase, setHasBip39Passphrase] = useState(false);
+   const [qrPayload, setQrPayload] = useState('');
+   const [recipientFpr, setRecipientFpr] = useState('');
+   const [restoreInput, setRestoreInput] = useState('');
+   const [decryptedRestoredMnemonic, setDecryptedRestoredMnemonic] = useState<string | null>(null);
+   const [error, setError] = useState('');
+   const [loading, setLoading] = useState(false);
+   const [copied, setCopied] = useState(false);
+   const [showQRScanner, setShowQRScanner] = useState(false);
+   const [isReadOnly, setIsReadOnly] = useState(false);
+   const [encryptedMnemonicCache, setEncryptedMnemonicCache] = useState<EncryptedBlob | null>(null);
+ 
+   useEffect(() => {
+     // When entering read-only mode, clear sensitive data for security.
+     if (isReadOnly) {
+       setMnemonic('');
+       setBackupMessagePassword('');
+       setRestoreMessagePassword('');
+       setPublicKeyInput('');
+       setPrivateKeyInput('');
+       setPrivateKeyPassphrase('');
+       setQrPayload('');
+       setRestoreInput('');
+       setDecryptedRestoredMnemonic(null);
+       setError('');
+     }
+   }, [isReadOnly]);
+ 
+   // Cleanup session key on component unmount
+   useEffect(() => {
+     return () => {
+       destroySessionKey();
+     };
+   }, []);
+ 
+ 
+   const copyToClipboard = async (text: string) => {
+     if (isReadOnly) {
+       setError("Copy to clipboard is disabled in Read-only mode.");
+       return;
+     }
+     try {
+       await navigator.clipboard.writeText(text);
+       setCopied(true);
+       window.setTimeout(() => setCopied(false), 1500);
+     } catch {
+       const ta = document.createElement("textarea");
+       ta.value = text;
+       ta.style.position = "fixed";
+       ta.style.left = "-9999px";
+       document.body.appendChild(ta);
+       ta.focus();
+       ta.select();
+       document.execCommand("copy");
+       document.body.removeChild(ta);
+       setCopied(true);
+       window.setTimeout(() => setCopied(false), 1500);
+     }
+   };
+ 
+   const handleBackup = async () => {
+     setLoading(true);
+     setError('');
+     setQrPayload('');
+     setRecipientFpr('');
+ 
+     try {
+       const validation = validateBip39Mnemonic(mnemonic);
+       if (!validation.valid) {
+         throw new Error(validation.error);
+       }
+ 
+       const plaintext = buildPlaintext(mnemonic, hasBip39Passphrase);
+ 
+       const result = await encryptToSeedPgp({
+         plaintext,
+         publicKeyArmored: publicKeyInput || undefined,
+         messagePassword: backupMessagePassword || undefined,
+       });
+ 
+       setQrPayload(result.framed);
+       if (result.recipientFingerprint) {
+         setRecipientFpr(result.recipientFingerprint);
+       }
+ 
+      // Initialize session key before encrypting
+      await getSessionKey();
+       // Encrypt mnemonic with session key and clear plaintext state
+       const blob = await encryptJsonToBlob({ mnemonic, timestamp: Date.now() });
+       setEncryptedMnemonicCache(blob);
+       setMnemonic(''); // Clear plaintext mnemonic
+     } catch (e) {
+       setError(e instanceof Error ? e.message : 'Encryption failed');
+     } finally {
+       setLoading(false);
+     }
+   };
+ 
+   const handleRestore = async () => {
+     setLoading(true);
+     setError('');
+     setDecryptedRestoredMnemonic(null);
+ 
+     try {
+       const result = await decryptSeedPgp({
+         frameText: restoreInput,
+         privateKeyArmored: privateKeyInput || undefined,
+         privateKeyPassphrase: privateKeyPassphrase || undefined,
+         messagePassword: restoreMessagePassword || undefined,
+       });
+ 
+       // Encrypt the restored mnemonic with the session key
+       await getSessionKey();
+       const blob = await encryptJsonToBlob({ mnemonic: result.w, timestamp: Date.now() });
+       setEncryptedMnemonicCache(blob);
+ 
+       // Temporarily display the mnemonic and then clear it
+       setDecryptedRestoredMnemonic(result.w);
+       setTimeout(() => {
+         setDecryptedRestoredMnemonic(null);
+       }, 10000); // Auto-clear after 10 seconds
+ 
+     } catch (e) {
+       setError(e instanceof Error ? e.message : 'Decryption failed');
+     } finally {
+       setLoading(false);
+     }
+   };
+ 
+   const handleLockAndClear = () => {
+     destroySessionKey();
+     setEncryptedMnemonicCache(null);
+     setMnemonic('');
+     setBackupMessagePassword('');
+     setRestoreMessagePassword('');
+     setPublicKeyInput('');
+     setPrivateKeyInput('');
+     setPrivateKeyPassphrase('');
+     setQrPayload('');
+     setRecipientFpr('');
+     setRestoreInput('');
+     setDecryptedRestoredMnemonic(null);
+     setError('');
+     setCopied(false);
+     setShowQRScanner(false);
+   };
+ 
+ 
+   return (
+     <>
+       <div className="min-h-screen bg-gradient-to-br from-slate-50 to-slate-100 text-slate-900 p-4 md:p-8">
+         <div className="max-w-5xl mx-auto bg-white rounded-2xl shadow-2xl overflow-hidden border border-slate-200">
+ 
+           {/* Header */}
+           <div className="bg-gradient-to-r from-slate-900 to-slate-800 p-6 text-white flex items-center justify-between">
+             <div className="flex items-center gap-3">
+               <div className="p-2 bg-blue-600 rounded-lg shadow-lg">
+                 <Shield size={28} />
+               </div>
+               <div>
+                 <h1 className="text-2xl font-bold tracking-tight">
+                   SeedPGP <span className="text-blue-400 font-mono text-base ml-2">v{__APP_VERSION__}</span>
+                 </h1>
+                 <p className="text-xs text-slate-400 mt-0.5">OpenPGP-secured BIP39 backup</p>
+               </div>
+             </div>
+             {encryptedMnemonicCache && ( // Show only if encrypted data exists
+               <button
+                 onClick={handleLockAndClear}
+                 className="flex items-center gap-2 text-sm text-red-400 bg-slate-800/50 px-3 py-1.5 rounded-lg hover:bg-red-900/50 transition-colors"
+               >
+                 <Lock size={16} />
+                 <span>Lock/Clear</span>
+               </button>
+             )}
+             <div className="flex items-center gap-4">
+               {isReadOnly && (
+                 <div className="flex items-center gap-2 text-sm text-amber-400 bg-slate-800/50 px-3 py-1.5 rounded-lg">
+                   <WifiOff size={16} />
+                   <span>Read-only</span>
+                 </div>
+               )}
+               {encryptedMnemonicCache && (
+                 <div className="flex items-center gap-2 text-sm text-green-400 bg-slate-800/50 px-3 py-1.5 rounded-lg">
+                   <Shield size={16} />
+                   <span>Encrypted in memory</span>
+                 </div>
+               )}
+               <div className="flex bg-slate-800/50 rounded-lg p-1 backdrop-blur">
+                 <button
+                   onClick={() => {
+                     setActiveTab('backup');
+                     setError('');
+                     setQrPayload('');
+                     setDecryptedRestoredMnemonic(null);
+                   }}
+                   className={`px-5 py-2 rounded-md text-sm font-semibold transition-all ${activeTab === 'backup'
+                     ? 'bg-white text-slate-900 shadow-lg'
+                     : 'text-slate-300 hover:text-white hover:bg-slate-700/50'
+                     }`}
+                 >
+                   Backup
+                 </button>
+                 <button
+                   onClick={() => {
+                     setActiveTab('restore');
+                     setError('');
+                     setQrPayload('');
+                     setDecryptedRestoredMnemonic(null);
+                   }}
+                   className={`px-5 py-2 rounded-md text-sm font-semibold transition-all ${activeTab === 'restore'
+                     ? 'bg-white text-slate-900 shadow-lg'
+                     : 'text-slate-300 hover:text-white hover:bg-slate-700/50'
+                     }`}
+                 >
+                   Restore
+                 </button>
+               </div>
+             </div>
+           </div>
+ 
+           <div className="p-6 md:p-8 space-y-6">
+             {/* Error Display */}
+             {error && (
+               <div className="p-4 bg-red-50 border-l-4 border-red-500 rounded-r-xl flex gap-3 text-red-800 text-sm items-start animate-in slide-in-from-top-2">
+                 <AlertCircle className="shrink-0 mt-0.5" size={20} />
+                 <div>
+                   <p className="font-bold mb-1">Error</p>
+                   <p className="whitespace-pre-wrap">{error}</p>
+                 </div>
+               </div>
+             )}
+ 
+             {/* Info Banner */}
+             {recipientFpr && activeTab === 'backup' && (
+               <div className="p-3 bg-blue-50 border border-blue-200 rounded-lg flex items-start gap-3 text-blue-800 text-xs animate-in fade-in">
+                 <Info size={16} className="shrink-0 mt-0.5" />
+                 <div>
+                   <strong>Recipient Key:</strong> <code className="bg-blue-100 px-1.5 py-0.5 rounded font-mono">{recipientFpr}</code>
+                 </div>
+               </div>
+             )}
+ 
+             {/* Main Content Grid */}
+             <div className="grid gap-6 md:grid-cols-3">
+               <div className="md:col-span-2 space-y-6">
+                 {activeTab === 'backup' ? (
+                   <>
+                     <div className="space-y-2">
+                       <label className="text-sm font-semibold text-slate-700">BIP39 Mnemonic</label>
+                       <textarea
+                         className="w-full h-32 p-4 bg-slate-50 border border-slate-200 rounded-xl text-sm font-mono focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all resize-none"
+                         data-sensitive="BIP39 Mnemonic"
+                         placeholder="Enter your 12 or 24 word seed phrase..."
+                         value={mnemonic}
+                         onChange={(e) => setMnemonic(e.target.value)}
+                         readOnly={isReadOnly}
+                       />
+                     </div>
+ 
+                     <PgpKeyInput
+                       label="PGP Public Key (Optional)"
+                       icon={FileKey}
+                       placeholder="-----BEGIN PGP PUBLIC KEY BLOCK-----&#10;&#10;Paste or drag & drop your public key..."
+                       value={publicKeyInput}
+                       onChange={setPublicKeyInput}
+                       readOnly={isReadOnly}
+                     />
+                   </>
+                 ) : (
+                   <>
+                     <div className="flex gap-2">
+                       <button
+                         onClick={() => setShowQRScanner(true)}
+                         disabled={isReadOnly}
+                         className="flex-1 py-3 bg-gradient-to-r from-purple-600 to-purple-700 text-white rounded-xl font-semibold flex items-center justify-center gap-2 hover:from-purple-700 hover:to-purple-800 transition-all shadow-lg disabled:opacity-50"
+                       >
+                         <QrCode size={18} />
+                         Scan QR Code
+                       </button>
+                     </div>
+ 
+                     <div className="space-y-2">
+                       <label className="text-sm font-semibold text-slate-700">SEEDPGP1 Payload</label>
+                       <textarea
+                         className="w-full h-32 p-4 bg-slate-50 border border-slate-200 rounded-xl text-xs font-mono focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all resize-none"
+                         placeholder="SEEDPGP1:0:ABCD:..."
+                         value={restoreInput}
+                         onChange={(e) => setRestoreInput(e.target.value)}
+                         readOnly={isReadOnly}
+                       />
+                     </div>
+ 
+                     <PgpKeyInput
+                       label="PGP Private Key (Optional)"
+                       icon={FileKey}
+                       data-sensitive="PGP Private Key"
+                       placeholder="-----BEGIN PGP PRIVATE KEY BLOCK-----&#10;&#10;Paste or drag & drop your private key..."
+                       value={privateKeyInput}
+                       onChange={setPrivateKeyInput}
+                       readOnly={isReadOnly}
+                     />
+ 
+                     {privateKeyInput && (
+                       <div className="space-y-2">
+                         <label className="text-xs font-bold text-slate-500 uppercase tracking-wider">Private Key Passphrase</label>
+                         <div className="relative">
+                           <Lock className="absolute left-3 top-3 text-slate-400" size={16} />
+                           <input
+                             type="password"
+                             data-sensitive="Message Password"
+                             className="w-full pl-10 pr-4 py-2.5 bg-white border border-slate-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all"
+                             placeholder="Unlock private key..."
+                             value={privateKeyPassphrase}
+                             onChange={(e) => setPrivateKeyPassphrase(e.target.value)}
+                             readOnly={isReadOnly}
+                           />
+                         </div>
+                       </div>
+                     )}
+                   </>
+                 )}
+               </div>
+ 
+               {/* Security Panel */}
+               <div className="space-y-6">
+                 <div className="p-5 bg-gradient-to-br from-slate-50 to-slate-100 rounded-2xl border-2 border-slate-200 shadow-inner space-y-4">
+                   <h3 className="text-sm font-bold text-slate-800 uppercase tracking-wider flex items-center gap-2">
+                     <Lock size={14} /> Security Options
+                   </h3>
+ 
+                   <div className="space-y-2">
+                     <label className="text-xs font-bold text-slate-500 uppercase tracking-wider">Message Password</label>
+                     <div className="relative">
+                       <Lock className="absolute left-3 top-3 text-slate-400" size={16} />
+                       <input
+                         type="password"
+                         className="w-full pl-10 pr-4 py-2.5 bg-white border border-slate-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 transition-all"
+                         placeholder="Optional password..."
+                         value={activeTab === 'backup' ? backupMessagePassword : restoreMessagePassword}
+                         onChange={(e) => activeTab === 'backup' ? setBackupMessagePassword(e.target.value) : setRestoreMessagePassword(e.target.value)}
+                         readOnly={isReadOnly}
+                       />
+                     </div>
+                     <p className="text-[10px] text-slate-500 mt-1">Symmetric encryption password (SKESK)</p>
+                   </div>
+ 
+ 
+                   {activeTab === 'backup' && (
+                     <div className="pt-3 border-t border-slate-300">
+                       <label className="flex items-center gap-2 cursor-pointer group">
+                         <input
+                           type="checkbox"
+                           checked={hasBip39Passphrase}
+                           onChange={(e) => setHasBip39Passphrase(e.target.checked)}
+                           disabled={isReadOnly}
+                           className="rounded text-blue-600 focus:ring-2 focus:ring-blue-500 transition-all"
+                         />
+                         <span className="text-xs font-medium text-slate-700 group-hover:text-slate-900 transition-colors">
+                           BIP39 25th word active
+                         </span>
+                       </label>
+                     </div>
+                   )}
+ 
+                   <ReadOnly
+                     isReadOnly={isReadOnly}
+                     onToggle={setIsReadOnly}
+                     appVersion={__APP_VERSION__}
+                     buildHash={__BUILD_HASH__}
+                   />
+                 </div>
+ 
+                 {/* Action Button */}
+                 {activeTab === 'backup' ? (
+                   <button
+                     onClick={handleBackup}
+                     disabled={!mnemonic || loading || isReadOnly}
+                     className="w-full py-4 bg-gradient-to-r from-blue-600 to-blue-700 text-white rounded-xl font-bold flex items-center justify-center gap-2 hover:from-blue-700 hover:to-blue-800 transition-all shadow-lg hover:shadow-xl disabled:opacity-50 disabled:cursor-not-allowed disabled:hover:from-blue-600 disabled:hover:to-blue-700"
+                   >
+                     {loading ? (
+                       <RefreshCw className="animate-spin" size={20} />
+                     ) : (
+                       <QrCode size={20} />
+                     )}
+                     {loading ? 'Generating...' : 'Generate QR Backup'}
+                   </button>
+                 ) : (
+                   <button
+                     onClick={handleRestore}
+                     disabled={!restoreInput || loading || isReadOnly}
+                     className="w-full py-4 bg-gradient-to-r from-slate-800 to-slate-900 text-white rounded-xl font-bold flex items-center justify-center gap-2 hover:from-slate-900 hover:to-black transition-all shadow-lg hover:shadow-xl disabled:opacity-50 disabled:cursor-not-allowed"
+                   >
+                     {loading ? (
+                       <RefreshCw className="animate-spin" size={20} />
+                     ) : (
+                       <Unlock size={20} />
+                     )}
+                     {loading ? 'Decrypting...' : 'Decrypt & Restore'}
+                   </button>
+                 )}
+               </div>
+             </div>
+ 
+             {/* QR Output */}
+             {qrPayload && activeTab === 'backup' && (
+               <div className="pt-6 border-t border-slate-200 space-y-6 animate-in fade-in slide-in-from-bottom-4">
+                 <div className="flex justify-center">
+                   <QrDisplay value={qrPayload} />
+                 </div>
+                 <div className="space-y-2">
+                   <div className="flex items-center justify-between gap-3">
+                     <label className="text-xs font-bold text-slate-500 uppercase tracking-wider">
+                       Raw payload (copy for backup)
+                     </label>
+ 
+                     <button
+                       type="button"
+                       onClick={() => copyToClipboard(qrPayload)}
+                       className="inline-flex items-center gap-2 px-3 py-1.5 rounded-lg bg-slate-900 text-white text-xs font-semibold hover:bg-black transition-colors"
+                     >
+                       {copied ? <CheckCircle2 size={14} /> : <QrCode size={14} />}
+                       {copied ? "Copied" : "Copy"}
+                     </button>
+                   </div>
+ 
+                   <textarea
+                     readOnly
+                     value={qrPayload}
+                     onFocus={(e) => e.currentTarget.select()}
+                     className="w-full h-28 p-3 bg-slate-900 rounded-xl font-mono text-[10px] text-green-400 border border-slate-700 shadow-inner leading-relaxed resize-none focus:outline-none focus:ring-2 focus:ring-blue-500"
+                   />
+                   <p className="text-[11px] text-slate-500">
+                     Tip: click the box to select all, or use Copy.
+                   </p>
+                 </div>
+               </div>
+             )}
+ 
+             {/* Restored Mnemonic */}
+             {decryptedRestoredMnemonic && activeTab === 'restore' && (
+               <div className="pt-6 border-t border-slate-200 animate-in zoom-in-95">
+                 <div className="p-6 bg-gradient-to-br from-green-50 to-emerald-50 border-2 border-green-300 rounded-2xl shadow-lg">
+                   <div className="flex items-center justify-between mb-4">
+                     <span className="font-bold text-green-700 flex items-center gap-2 text-lg">
+                       <CheckCircle2 size={22} /> Mnemonic Recovered
+                     </span>
+                     <button
+                       onClick={() => setDecryptedRestoredMnemonic(null)}
+                       className="p-2.5 hover:bg-green-100 rounded-xl transition-all text-green-700 hover:shadow"
+                     >
+                       <EyeOff size={22} /> Hide
+                     </button>
+                   </div>
+ 
+                   <div className="p-6 bg-white rounded-xl border-2 border-green-200 shadow-sm">
+                     <p className="font-mono text-center text-lg text-slate-800 tracking-wide leading-relaxed break-words">
+                       {decryptedRestoredMnemonic}
+                     </p>
+                   </div>
+                 </div>
+               </div>
+             )}
+           </div>
+         </div>
+ 
+         {/* Footer */}
+         <div className="mt-8 text-center text-xs text-slate-500">
+           <p>SeedPGP v{__APP_VERSION__} • OpenPGP (RFC 4880) + Base45 (RFC 9285) + CRC16/CCITT-FALSE</p>
+           <p className="mt-1">Never share your private keys or seed phrases. Always verify on an airgapped device.</p>
+         </div>
+       </div>
+ 
+       {/* QR Scanner Modal */}
+       {showQRScanner && (
+         <QRScanner
+           onScanSuccess={(scannedText) => {
+             setRestoreInput(scannedText);
+             setShowQRScanner(false);
+             setError('');
+           }}
+           onClose={() => setShowQRScanner(false)}
+         />
+       )}
+       <div className="max-w-4xl mx-auto p-8">
+         <h1>SeedPGP v1.2.0</h1>
+         {/* ... rest of your app ... */}
+       </div>
+ 
+       {/* Floating Storage Monitor - bottom right */}
+       {!isReadOnly && (
+         <>
+           <StorageIndicator />
+           <SecurityWarnings />
+           <ClipboardTracker />
+         </>
+       )}
+     </>
+ 
+   );
+ 
+ }
+ 
+ export default App;
--- a/src/components/ClipboardTracker.tsx
+++ b/src/components/ClipboardTracker.tsx
@@ -0,0 +1,184 @@
+import { useState, useEffect } from 'react';
+
+interface ClipboardEvent {
+    timestamp: Date;
+    field: string;
+    length: number; // Show length without storing actual content
+}
+
+export const ClipboardTracker = () => {
+    const [events, setEvents] = useState<ClipboardEvent[]>([]);
+    const [isExpanded, setIsExpanded] = useState(false);
+
+    useEffect(() => {
+        const handleCopy = (e: ClipboardEvent & Event) => {
+            const target = e.target as HTMLElement;
+
+            // Get selection to measure length
+            const selection = window.getSelection()?.toString() || '';
+            const length = selection.length;
+
+            if (length === 0) return; // Nothing copied
+
+            // Detect field name
+            let field = 'Unknown field';
+
+            if (target.tagName === 'TEXTAREA' || target.tagName === 'INPUT') {
+                // Try multiple ways to identify the field
+                field =
+                    target.getAttribute('aria-label') ||
+                    target.getAttribute('name') ||
+                    target.getAttribute('id') ||
+                    (target as HTMLInputElement).type ||
+                    target.tagName.toLowerCase();
+
+                // Check parent labels
+                const label = target.closest('label') ||
+                    document.querySelector(`label[for="${target.id}"]`);
+                if (label) {
+                    field = label.textContent?.trim() || field;
+                }
+
+                // Check for data-sensitive attribute
+                const sensitiveAttr = target.getAttribute('data-sensitive') ||
+                    target.closest('[data-sensitive]')?.getAttribute('data-sensitive');
+                if (sensitiveAttr) {
+                    field = sensitiveAttr;
+                }
+
+                // Detect if it looks like sensitive data
+                const isSensitive = /mnemonic|seed|key|private|password|secret/i.test(
+                    target.className + ' ' + field + ' ' + (target.getAttribute('placeholder') || '')
+                );
+
+                if (isSensitive && field === target.tagName.toLowerCase()) {
+                    // Try to guess from placeholder
+                    const placeholder = target.getAttribute('placeholder');
+                    if (placeholder) {
+                        field = placeholder.substring(0, 40) + '...';
+                    }
+                }
+            }
+
+            setEvents(prev => [
+                { timestamp: new Date(), field, length },
+                ...prev.slice(0, 9) // Keep last 10 events
+            ]);
+
+            // Auto-expand on first copy
+            if (events.length === 0) {
+                setIsExpanded(true);
+            }
+        };
+
+        document.addEventListener('copy', handleCopy as EventListener);
+        return () => document.removeEventListener('copy', handleCopy as EventListener);
+    }, [events.length]);
+
+    const clearClipboard = async () => {
+        try {
+            // Actually clear the system clipboard
+            await navigator.clipboard.writeText('');
+
+            // Clear history
+            setEvents([]);
+
+            // Show success briefly
+            alert('✅ Clipboard cleared and history wiped');
+        } catch (err) {
+            // Fallback for browsers that don't support clipboard API
+            const dummy = document.createElement('textarea');
+            dummy.value = '';
+            document.body.appendChild(dummy);
+            dummy.select();
+            document.execCommand('copy');
+            document.body.removeChild(dummy);
+
+            setEvents([]);
+            alert('✅ History cleared (clipboard may require manual clearing)');
+        }
+    };
+
+    return (
+        <div className="fixed bottom-24 right-4 z-50 max-w-sm">
+            <div className={`rounded-lg shadow-lg border-2 transition-all ${events.length > 0
+                ? 'bg-orange-50 border-orange-400'
+                : 'bg-gray-50 border-gray-300'
+                }`}>
+
+                {/* Header */}
+                <div
+                    className={`px-4 py-3 cursor-pointer flex items-center justify-between rounded-t-lg transition-colors ${events.length > 0 ? 'hover:bg-orange-100' : 'hover:bg-gray-100'
+                        }`}
+                    onClick={() => setIsExpanded(!isExpanded)}
+                >
+                    <div className="flex items-center gap-2">
+                        <span className="text-lg">📋</span>
+                        <span className="font-semibold text-sm text-gray-700">Clipboard Activity</span>
+                    </div>
+
+                    <div className="flex items-center gap-2">
+                        {events.length > 0 && (
+                            <span className="text-xs bg-orange-500 text-white px-2 py-0.5 rounded-full font-medium">
+                                {events.length}
+                            </span>
+                        )}
+                        <span className="text-gray-400 text-sm">{isExpanded ? '▼' : '▶'}</span>
+                    </div>
+                </div>
+
+                {/* Expanded Content */}
+                {isExpanded && (
+                    <div className="p-4 border-t border-gray-300">
+                        {events.length > 0 && (
+                            <div className="mb-3 bg-orange-100 border border-orange-300 rounded-md p-3 text-xs text-orange-900">
+                                <strong>⚠️ Clipboard Warning:</strong> Copied data is accessible to other apps,
+                                browser tabs, and extensions. Clear clipboard after use.
+                            </div>
+                        )}
+
+                        {events.length > 0 ? (
+                            <>
+                                <div className="space-y-2 mb-3 max-h-64 overflow-y-auto">
+                                    {events.map((event, idx) => (
+                                        <div
+                                            key={idx}
+                                            className="bg-white border border-orange-200 rounded-md p-2 text-xs"
+                                        >
+                                            <div className="flex justify-between items-start gap-2 mb-1">
+                                                <span className="font-semibold text-orange-900 break-all">
+                                                    {event.field}
+                                                </span>
+                                                <span className="text-gray-400 text-[10px] whitespace-nowrap">
+                                                    {event.timestamp.toLocaleTimeString()}
+                                                </span>
+                                            </div>
+                                            <div className="text-gray-600 text-[10px]">
+                                                Copied {event.length} character{event.length !== 1 ? 's' : ''}
+                                            </div>
+                                        </div>
+                                    ))}
+                                </div>
+
+                                <button
+                                    onClick={(e) => {
+                                        e.stopPropagation(); // Prevent collapse toggle
+                                        clearClipboard();
+                                    }}
+                                    className="w-full text-xs py-2 px-3 bg-orange-600 hover:bg-orange-700 text-white rounded-md font-medium transition-colors"
+                                >
+                                    🗑️ Clear Clipboard & History
+                                </button>
+                            </>
+                        ) : (
+                            <div className="text-center py-4">
+                                <div className="text-3xl mb-2">✅</div>
+                                <p className="text-xs text-gray-500">No clipboard activity detected</p>
+                            </div>
+                        )}
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+};
--- a/src/components/PgpKeyInput.tsx
+++ b/src/components/PgpKeyInput.tsx
@@ -1,15 +1,14 @@
 import React, { useState } from 'react';
 import { Upload } from 'lucide-react';
 import type { LucideIcon } from "lucide-react";
+
 interface PgpKeyInputProps {
    value: string;
    onChange: (value: string) => void;
    placeholder: string;
    label: string;
    icon?: LucideIcon;
-
-
-
+    readOnly?: boolean;
 }

 export const PgpKeyInput: React.FC<PgpKeyInputProps> = ({
@@ -17,21 +16,25 @@ export const PgpKeyInput: React.FC<PgpKeyInputProps> = ({
    onChange,
    placeholder,
    label,
-    icon: Icon
+    icon: Icon,
+    readOnly = false,
 }) => {
    const [isDragging, setIsDragging] = useState(false);

    const handleDragOver = (e: React.DragEvent) => {
+        if (readOnly) return;
        e.preventDefault();
        setIsDragging(true);
    };

    const handleDragLeave = (e: React.DragEvent) => {
+        if (readOnly) return;
        e.preventDefault();
        setIsDragging(false);
    };

    const handleDrop = (e: React.DragEvent) => {
+        if (readOnly) return;
        e.preventDefault();
        setIsDragging(false);

@@ -53,24 +56,27 @@ export const PgpKeyInput: React.FC<PgpKeyInputProps> = ({
                <span className="flex items-center gap-2">
                    {Icon && <Icon size={14} />} {label}
                </span>
-                <span className="text-[10px] text-slate-400 font-normal bg-slate-100 px-2 py-0.5 rounded-full border border-slate-200">
-                    Drag & Drop .asc file
-                </span>
+                {!readOnly && (
+                    <span className="text-[10px] text-slate-400 font-normal bg-slate-100 px-2 py-0.5 rounded-full border border-slate-200">
+                        Drag & Drop .asc file
+                    </span>
+                )}
            </label>
            <div
-                className={`relative transition-all duration-200 ${isDragging ? 'scale-[1.01]' : ''}`}
+                className={`relative transition-all duration-200 ${isDragging && !readOnly ? 'scale-[1.01]' : ''}`}
                onDragOver={handleDragOver}
                onDragLeave={handleDragLeave}
                onDrop={handleDrop}
            >
                <textarea
-                    className={`w-full h-40 p-3 bg-slate-50 border rounded-xl text-xs font-mono transition-colors resize-none focus:outline-none focus:ring-2 focus:ring-blue-500 ${isDragging ? 'border-blue-500 bg-blue-50' : 'border-slate-200'
+                    className={`w-full h-40 p-3 bg-slate-50 border rounded-xl text-xs font-mono transition-colors resize-none focus:outline-none focus:ring-2 focus:ring-blue-500 ${isDragging && !readOnly ? 'border-blue-500 bg-blue-50' : 'border-slate-200'
                        }`}
                    placeholder={placeholder}
                    value={value}
                    onChange={(e) => onChange(e.target.value)}
+                    readOnly={readOnly}
                />
-                {isDragging && (
+                {isDragging && !readOnly && (
                    <div className="absolute inset-0 flex items-center justify-center bg-blue-50/90 rounded-xl border-2 border-dashed border-blue-500 pointer-events-none z-10">
                        <div className="text-blue-600 font-bold flex flex-col items-center animate-bounce">
                            <Upload size={24} />
--- a/src/components/QRScanner.tsx
+++ b/src/components/QRScanner.tsx
@@ -0,0 +1,224 @@
+import { useState, useRef } from 'react';
+import { Camera, Upload, X, CheckCircle2, AlertCircle, Info } from 'lucide-react';
+import { Html5Qrcode } from 'html5-qrcode';
+
+interface QRScannerProps {
+    onScanSuccess: (scannedText: string) => void;
+    onClose: () => void;
+}
+
+export default function QRScanner({ onScanSuccess, onClose }: QRScannerProps) {
+    const [scanMode, setScanMode] = useState<'camera' | 'file' | null>(null);
+    const [scanning, setScanning] = useState(false);
+    const [error, setError] = useState<string>('');
+    const [success, setSuccess] = useState(false);
+    const html5QrCodeRef = useRef<Html5Qrcode | null>(null);
+    const fileInputRef = useRef<HTMLInputElement>(null);
+
+    const startCamera = async () => {
+        setError('');
+        setScanMode('camera');
+        setScanning(true);
+
+        // Wait for DOM to render the #qr-reader div
+        await new Promise(resolve => setTimeout(resolve, 100));
+
+        try {
+            // Check if we're on HTTPS or localhost
+            if (window.location.protocol !== 'https:' && !window.location.hostname.includes('localhost')) {
+                throw new Error('Camera requires HTTPS or localhost. Use: bun run dev');
+            }
+
+            const html5QrCode = new Html5Qrcode('qr-reader');
+            html5QrCodeRef.current = html5QrCode;
+
+            await html5QrCode.start(
+                { facingMode: 'environment' },
+                {
+                    fps: 10,
+                    qrbox: { width: 250, height: 250 },
+                    aspectRatio: 1.0,
+                },
+                (decodedText) => {
+                    if (decodedText.startsWith('SEEDPGP1:')) {
+                        setSuccess(true);
+                        onScanSuccess(decodedText);
+                        stopCamera();
+                    } else {
+                        setError('QR code found, but not a valid SEEDPGP1 frame');
+                    }
+                },
+                () => {
+                    // Ignore frequent scanning errors
+                }
+            );
+        } catch (err: any) {
+            console.error('Camera error:', err);
+            setError(`Camera failed: ${err.message || 'Permission denied or not available'}`);
+            setScanning(false);
+            setScanMode(null);
+        }
+    };
+
+
+    const stopCamera = async () => {
+        if (html5QrCodeRef.current) {
+            try {
+                await html5QrCodeRef.current.stop();
+                html5QrCodeRef.current.clear();
+            } catch (err) {
+                console.error('Error stopping camera:', err);
+            }
+            html5QrCodeRef.current = null;
+        }
+        setScanning(false);
+        setScanMode(null);
+    };
+
+    const handleFileUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
+        const file = e.target.files?.[0];
+        if (!file) return;
+
+        setError('');
+        setScanMode('file');
+        setScanning(true);
+
+        try {
+            const html5QrCode = new Html5Qrcode('qr-reader-file');
+
+            // Try scanning with verbose mode
+            const decodedText = await html5QrCode.scanFile(file, true);
+
+            if (decodedText.startsWith('SEEDPGP1:')) {
+                setSuccess(true);
+                onScanSuccess(decodedText);
+                html5QrCode.clear();
+            } else {
+                setError(`Found QR code, but not SEEDPGP format: ${decodedText.substring(0, 30)}...`);
+            }
+        } catch (err: any) {
+            console.error('File scan error:', err);
+
+            // Provide helpful error messages
+            if (err.message?.includes('No MultiFormat')) {
+                setError('Could not detect QR code in image. Try: 1) Taking a clearer photo, 2) Ensuring good lighting, 3) Screenshot from the Backup tab');
+            } else {
+                setError(`Scan failed: ${err.message || 'Unknown error'}`);
+            }
+        } finally {
+            setScanning(false);
+            // Reset file input so same file can be selected again
+            if (fileInputRef.current) {
+                fileInputRef.current.value = '';
+            }
+        }
+    };
+
+    const handleClose = async () => {
+        await stopCamera();
+        onClose();
+    };
+
+    return (
+        <div className="fixed inset-0 bg-black/60 backdrop-blur-sm z-50 flex items-center justify-center p-4 animate-in fade-in">
+            <div className="bg-white rounded-2xl shadow-2xl max-w-md w-full overflow-hidden animate-in zoom-in-95">
+                {/* Header */}
+                <div className="bg-gradient-to-r from-slate-900 to-slate-800 p-4 text-white flex items-center justify-between">
+                    <div className="flex items-center gap-2">
+                        <Camera size={20} />
+                        <h2 className="font-bold text-lg">Scan QR Code</h2>
+                    </div>
+                    <button
+                        onClick={handleClose}
+                        className="p-1.5 hover:bg-white/20 rounded-lg transition-colors"
+                    >
+                        <X size={20} />
+                    </button>
+                </div>
+
+                {/* Content */}
+                <div className="p-6 space-y-4">
+                    {/* Error Display */}
+                    {error && (
+                        <div className="p-3 bg-red-50 border-l-4 border-red-500 rounded-r-lg flex gap-2 text-red-800 text-xs leading-relaxed">
+                            <AlertCircle size={16} className="shrink-0 mt-0.5" />
+                            <p>{error}</p>
+                        </div>
+                    )}
+
+                    {/* Success Display */}
+                    {success && (
+                        <div className="p-3 bg-green-50 border-l-4 border-green-500 rounded-r-lg flex gap-2 text-green-800 text-sm">
+                            <CheckCircle2 size={16} className="shrink-0 mt-0.5" />
+                            <p>QR code scanned successfully!</p>
+                        </div>
+                    )}
+
+                    {/* Mode Selection */}
+                    {!scanMode && (
+                        <div className="space-y-3">
+                            <button
+                                onClick={startCamera}
+                                className="w-full py-4 bg-gradient-to-r from-blue-600 to-blue-700 text-white rounded-xl font-semibold flex items-center justify-center gap-2 hover:from-blue-700 hover:to-blue-800 transition-all shadow-lg"
+                            >
+                                <Camera size={20} />
+                                Use Camera
+                            </button>
+
+                            <button
+                                onClick={() => fileInputRef.current?.click()}
+                                className="w-full py-4 bg-gradient-to-r from-slate-700 to-slate-800 text-white rounded-xl font-semibold flex items-center justify-center gap-2 hover:from-slate-800 hover:to-slate-900 transition-all shadow-lg"
+                            >
+                                <Upload size={20} />
+                                Upload Image
+                            </button>
+
+                            <input
+                                ref={fileInputRef}
+                                type="file"
+                                accept="image/*"
+                                onChange={handleFileUpload}
+                                className="hidden"
+                            />
+
+                            {/* Info Box */}
+                            <div className="pt-4 border-t border-slate-200">
+                                <div className="flex gap-2 text-xs text-slate-600 leading-relaxed">
+                                    <Info size={14} className="shrink-0 mt-0.5 text-blue-600" />
+                                    <div>
+                                        <p><strong>Camera:</strong> Requires HTTPS or localhost</p>
+                                        <p className="mt-1"><strong>Upload:</strong> Screenshot QR from Backup tab for testing</p>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+                    )}
+
+                    {/* Camera View */}
+                    {scanMode === 'camera' && scanning && (
+                        <div className="space-y-3">
+                            <div id="qr-reader" className="rounded-lg overflow-hidden border-2 border-slate-200"></div>
+                            <button
+                                onClick={stopCamera}
+                                className="w-full py-3 bg-red-600 text-white rounded-lg font-semibold hover:bg-red-700 transition-colors"
+                            >
+                                Stop Camera
+                            </button>
+                        </div>
+                    )}
+
+                    {/* File Processing View */}
+                    {scanMode === 'file' && scanning && (
+                        <div className="py-8 text-center">
+                            <div className="inline-block animate-spin rounded-full h-8 w-8 border-4 border-slate-200 border-t-blue-600"></div>
+                            <p className="mt-3 text-sm text-slate-600">Processing image...</p>
+                        </div>
+                    )}
+
+                    {/* Hidden div for file scanning */}
+                    <div id="qr-reader-file" className="hidden"></div>
+                </div>
+            </div>
+        </div>
+    );
+}
--- a/src/components/QrDisplay.tsx
+++ b/src/components/QrDisplay.tsx
@@ -1,4 +1,5 @@
 import { useEffect, useState } from 'react';
+import { Download } from 'lucide-react';
 import QRCode from 'qrcode';

 interface QrDisplayProps {
@@ -11,21 +12,61 @@ export const QrDisplay: React.FC<QrDisplayProps> = ({ value }) => {
    useEffect(() => {
        if (value) {
            QRCode.toDataURL(value, {
-                errorCorrectionLevel: 'Q',
+                errorCorrectionLevel: 'M',
                type: 'image/png',
                width: 512,
-                margin: 2,
+                margin: 4,
+                color: {
+                    dark: '#000000',
+                    light: '#FFFFFF'
+                }
            })
                .then(setDataUrl)
                .catch(console.error);
        }
    }, [value]);

+    const handleDownload = () => {
+        if (!dataUrl) return;
+
+        // Generate filename: SeedPGP_YYYY-MM-DD_HHMMSS.png
+        const now = new Date();
+        const date = now.toISOString().split('T')[0]; // YYYY-MM-DD
+        const time = now.toTimeString().split(' ')[0].replace(/:/g, ''); // HHMMSS
+        const filename = `SeedPGP_${date}_${time}.png`;
+
+        // Create download link
+        const link = document.createElement('a');
+        link.href = dataUrl;
+        link.download = filename;
+        document.body.appendChild(link);
+        link.click();
+        document.body.removeChild(link);
+    };
+
    if (!dataUrl) return null;

    return (
-        <div className="flex items-center justify-center p-4 bg-white rounded-xl border-2 border-slate-200">
-            <img src={dataUrl} alt="SeedPGP QR Code" className="w-64 h-64" />
+        <div className="flex flex-col items-center gap-4">
+            <div className="flex items-center justify-center p-4 bg-white rounded-xl border-2 border-slate-200">
+                <img
+                    src={dataUrl}
+                    alt="SeedPGP QR Code"
+                    className="w-80 h-80"
+                />
+            </div>
+
+            <button
+                onClick={handleDownload}
+                className="inline-flex items-center gap-2 px-4 py-2.5 bg-gradient-to-r from-green-600 to-green-700 text-white rounded-lg font-semibold hover:from-green-700 hover:to-green-800 transition-all shadow-lg hover:shadow-xl"
+            >
+                <Download size={18} />
+                Download QR Code
+            </button>
+
+            <p className="text-xs text-slate-500 text-center max-w-sm">
+                Downloads as: SeedPGP_2026-01-28_231645.png
+            </p>
        </div>
    );
 };
--- a/src/components/ReadOnly.tsx
+++ b/src/components/ReadOnly.tsx
@@ -0,0 +1,39 @@
+import { WifiOff } from 'lucide-react';
+
+type ReadOnlyProps = {
+  isReadOnly: boolean;
+  onToggle: (isReadOnly: boolean) => void;
+  buildHash: string;
+  appVersion: string;
+};
+
+const CSP_POLICY = `default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'none';`;
+
+export function ReadOnly({ isReadOnly, onToggle, buildHash, appVersion }: ReadOnlyProps) {
+  return (
+    <div className="pt-3 border-t border-slate-300">
+      <label className="flex items-center gap-2 cursor-pointer group">
+        <input
+          type="checkbox"
+          checked={isReadOnly}
+          onChange={(e) => onToggle(e.target.checked)}
+          className="rounded text-blue-600 focus:ring-2 focus:ring-blue-500 transition-all"
+        />
+        <span className="text-xs font-medium text-slate-700 group-hover:text-slate-900 transition-colors">
+          Read-only Mode
+        </span>
+      </label>
+      {isReadOnly && (
+        <div className="mt-4 p-3 bg-slate-800 text-slate-200 rounded-lg text-xs space-y-2 animate-in fade-in">
+          <p className="font-bold flex items-center gap-2"><WifiOff size={14} /> Network & Persistence Disabled</p>
+          <div className="font-mono text-[10px] space-y-1">
+            <p><span className="font-semibold text-slate-400">Version:</span> {appVersion}</p>
+            <p><span className="font-semibold text-slate-400">Build:</span> {buildHash}</p>
+            <p className="pt-1 font-semibold text-slate-400">Content Security Policy:</p>
+            <p className="text-sky-300 break-words">{CSP_POLICY}</p>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}
--- a/src/components/SecurityWarnings.tsx
+++ b/src/components/SecurityWarnings.tsx
@@ -0,0 +1,81 @@
+import { useState } from 'react';
+
+export const SecurityWarnings = () => {
+    const [isExpanded, setIsExpanded] = useState(false);
+
+    return (
+        <div className="fixed bottom-4 left-4 z-50 max-w-sm">
+            <div className="bg-yellow-50 border-2 border-yellow-400 rounded-lg shadow-lg">
+
+                {/* Header */}
+                <div
+                    className="px-4 py-3 cursor-pointer flex items-center justify-between hover:bg-yellow-100 transition-colors rounded-t-lg"
+                    onClick={() => setIsExpanded(!isExpanded)}
+                >
+                    <div className="flex items-center gap-2">
+                        <span className="text-lg">⚠️</span>
+                        <span className="font-semibold text-sm text-yellow-900">Security Limitations</span>
+                    </div>
+                    <span className="text-yellow-600 text-sm">{isExpanded ? '▼' : '▶'}</span>
+                </div>
+
+                {/* Expanded Content */}
+                {isExpanded && (
+                    <div className="px-4 py-3 border-t border-yellow-300 space-y-3 max-h-96 overflow-y-auto">
+
+                        <Warning
+                            icon="🧵"
+                            title="JavaScript Strings are Immutable"
+                            description="Strings cannot be overwritten in memory. Copies persist until garbage collection runs (timing unpredictable)."
+                        />
+
+                        <Warning
+                            icon="🗑️"
+                            title="No Guaranteed Memory Wiping"
+                            description="JavaScript has no secure memory clearing. Sensitive data may linger in RAM until GC or browser restart."
+                        />
+
+                        <Warning
+                            icon="📋"
+                            title="Clipboard Exposure"
+                            description="Copied data is accessible to other tabs/apps. Browser extensions can read clipboard contents."
+                        />
+
+                        <Warning
+                            icon="💾"
+                            title="Browser Storage Persistence"
+                            description="localStorage survives browser restart. sessionStorage survives page refresh. Both readable by any script on this domain."
+                        />
+
+                        <Warning
+                            icon="🔍"
+                            title="DevTools Access"
+                            description="All app state, memory, and storage visible in browser DevTools. Never use on untrusted devices."
+                        />
+
+                        <Warning
+                            icon="🌐"
+                            title="Network Risks (When Online)"
+                            description="If hosted online: DNS, HTTPS, CDN, and browser can see usage patterns. Use offline/local for maximum security."
+                        />
+
+                        <div className="pt-2 border-t border-yellow-300 text-xs text-yellow-800">
+                            <strong>Recommendation:</strong> Use this tool on a dedicated offline device.
+                            Clear browser data after each use. Never use on shared/public computers.
+                        </div>
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+};
+
+const Warning = ({ icon, title, description }: { icon: string; title: string; description: string }) => (
+    <div className="flex gap-2 text-xs">
+        <span className="text-base flex-shrink-0">{icon}</span>
+        <div>
+            <div className="font-semibold text-yellow-900 mb-0.5">{title}</div>
+            <div className="text-yellow-800 leading-relaxed">{description}</div>
+        </div>
+    </div>
+);
--- a/src/components/StorageIndicator.tsx
+++ b/src/components/StorageIndicator.tsx
@@ -0,0 +1,150 @@
+import { useState, useEffect } from 'react';
+
+interface StorageItem {
+    key: string;
+    value: string;
+    size: number;
+    isSensitive: boolean;
+}
+
+export const StorageIndicator = () => {
+    const [localItems, setLocalItems] = useState<StorageItem[]>([]);
+    const [sessionItems, setSessionItems] = useState<StorageItem[]>([]);
+    const [isExpanded, setIsExpanded] = useState(false);
+
+    const SENSITIVE_PATTERNS = ['key', 'mnemonic', 'seed', 'private', 'secret', 'pgp', 'password'];
+
+    const isSensitiveKey = (key: string): boolean => {
+        const lowerKey = key.toLowerCase();
+        return SENSITIVE_PATTERNS.some(pattern => lowerKey.includes(pattern));
+    };
+
+    const getStorageItems = (storage: Storage): StorageItem[] => {
+        const items: StorageItem[] = [];
+        for (let i = 0; i < storage.length; i++) {
+            const key = storage.key(i);
+            if (key) {
+                const value = storage.getItem(key) || '';
+                items.push({
+                    key,
+                    value: value.substring(0, 50) + (value.length > 50 ? '...' : ''),
+                    size: new Blob([value]).size,
+                    isSensitive: isSensitiveKey(key)
+                });
+            }
+        }
+        return items.sort((a, b) => (b.isSensitive ? 1 : 0) - (a.isSensitive ? 1 : 0));
+    };
+
+    const refreshStorage = () => {
+        setLocalItems(getStorageItems(localStorage));
+        setSessionItems(getStorageItems(sessionStorage));
+    };
+
+    useEffect(() => {
+        refreshStorage();
+        const interval = setInterval(refreshStorage, 2000);
+        return () => clearInterval(interval);
+    }, []);
+
+    const totalItems = localItems.length + sessionItems.length;
+    const sensitiveCount = [...localItems, ...sessionItems].filter(i => i.isSensitive).length;
+
+    return (
+        <div className="fixed bottom-4 right-4 z-50 max-w-md">
+            <div className={`bg-white rounded-lg shadow-lg border-2 ${sensitiveCount > 0 ? 'border-red-400' : 'border-gray-300'
+                } transition-all duration-200`}>
+
+                {/* Header Bar */}
+                <div
+                    className={`px-4 py-3 rounded-t-lg cursor-pointer flex items-center justify-between ${sensitiveCount > 0 ? 'bg-red-50' : 'bg-gray-50'
+                        } hover:opacity-90 transition-opacity`}
+                    onClick={() => setIsExpanded(!isExpanded)}
+                >
+                    <div className="flex items-center gap-2">
+                        <span className="text-lg">🗄️</span>
+                        <span className="font-semibold text-sm text-gray-700">Storage Monitor</span>
+                    </div>
+
+                    <div className="flex items-center gap-2">
+                        {sensitiveCount > 0 && (
+                            <span className="text-xs bg-red-500 text-white px-2 py-0.5 rounded-full font-medium">
+                                {sensitiveCount}⚠️
+                            </span>
+                        )}
+                        <span className={`text-xs px-2 py-0.5 rounded-full font-medium ${totalItems > 0 ? 'bg-blue-100 text-blue-700' : 'bg-green-100 text-green-700'
+                            }`}>
+                            {totalItems === 0 ? '✓ Empty' : `${totalItems} item${totalItems !== 1 ? 's' : ''}`}
+                        </span>
+                        <span className="text-gray-400 text-sm">{isExpanded ? '▼' : '▶'}</span>
+                    </div>
+                </div>
+
+                {/* Expanded Content */}
+                {isExpanded && (
+                    <div className="p-4 max-h-96 overflow-y-auto">
+                        {sensitiveCount > 0 && (
+                            <div className="mb-3 bg-yellow-50 border border-yellow-300 rounded-md p-3 text-xs">
+                                <div className="flex items-start gap-2">
+                                    <span className="text-yellow-600 mt-0.5">⚠️</span>
+                                    <div className="text-yellow-800">
+                                        <strong>Security Notice:</strong> Sensitive data persists in browser storage
+                                        (survives refresh/restart). Clear manually if on shared device.
+                                    </div>
+                                </div>
+                            </div>
+                        )}
+
+                        <div className="space-y-3">
+                            <StorageSection title="localStorage" items={localItems} icon="💾" />
+                            <StorageSection title="sessionStorage" items={sessionItems} icon="⏱️" />
+                        </div>
+
+                        {totalItems === 0 && (
+                            <div className="text-center py-6">
+                                <div className="text-4xl mb-2">✅</div>
+                                <p className="text-sm text-gray-500">No data in browser storage</p>
+                            </div>
+                        )}
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+};
+
+const StorageSection = ({ title, items, icon }: { title: string; items: StorageItem[]; icon: string }) => {
+    if (items.length === 0) return null;
+
+    return (
+        <div>
+            <h4 className="text-xs font-bold text-gray-500 mb-2 flex items-center gap-1">
+                <span>{icon}</span>
+                <span className="uppercase">{title}</span>
+                <span className="ml-auto text-gray-400 font-normal">({items.length})</span>
+            </h4>
+            <div className="space-y-2">
+                {items.map((item) => (
+                    <div
+                        key={item.key}
+                        className={`text-xs rounded-md border p-2 ${item.isSensitive
+                                ? 'bg-red-50 border-red-300'
+                                : 'bg-gray-50 border-gray-200'
+                            }`}
+                    >
+                        <div className="flex justify-between items-start gap-2 mb-1">
+                            <span className={`font-mono font-semibold text-[11px] break-all ${item.isSensitive ? 'text-red-700' : 'text-gray-700'
+                                }`}>
+                                {item.isSensitive && '🔴 '}{item.key}
+                            </span>
+                            <span className="text-gray-400 text-[10px] whitespace-nowrap">{item.size}B</span>
+                        </div>
+                        <div className="text-gray-500 font-mono text-[10px] break-all leading-relaxed opacity-70">
+                            {item.value}
+                        </div>
+                    </div>
+                ))}
+            </div>
+        </div>
+    );
+};
--- a/src/lib/seedpgp.ts
+++ b/src/lib/seedpgp.ts
@@ -3,6 +3,12 @@ import { base45Encode, base45Decode } from "./base45";
 import { crc16CcittFalse } from "./crc16";
 import type { SeedPgpPlaintext, ParsedSeedPgpFrame } from "./types";

+// Configure OpenPGP.js (disable warnings)
+openpgp.config.showComment = false;
+openpgp.config.showVersion = false;
+openpgp.config.allowUnauthenticatedMessages = true; // Suppress AES warning
+openpgp.config.allowUnauthenticatedStream = true;   // Suppress stream warning
+
 function nonEmptyTrimmed(s?: string): string | undefined {
    if (!s) return undefined;
    const t = s.trim();
--- a/src/lib/sessionCrypto.ts
+++ b/src/lib/sessionCrypto.ts
@@ -0,0 +1,205 @@
+/**
+ * @file Ephemeral, per-session, in-memory encryption using Web Crypto API.
+ *
+ * This module manages a single, non-exportable AES-GCM key for a user's session.
+ * It's designed to encrypt sensitive data (like a mnemonic) before it's placed
+ * into React state, mitigating the risk of plaintext data in memory snapshots.
+ * The key is destroyed when the user navigates away or the session ends.
+ */
+
+// --- Helper functions for encoding ---
+
+function base64ToBytes(base64: string): Uint8Array {
+  const binString = atob(base64);
+  return Uint8Array.from(binString, (m) => m.codePointAt(0)!);
+}
+
+function bytesToBase64(bytes: Uint8Array): string {
+  const binString = Array.from(bytes, (byte) =>
+    String.fromCodePoint(byte),
+  ).join("");
+  return btoa(binString);
+}
+
+// --- Module-level state ---
+
+/**
+ * Holds the session's AES-GCM key. This variable is not exported and is
+ * only accessible through the functions in this module.
+ * @private
+ */
+let sessionKey: CryptoKey | null = null;
+const KEY_ALGORITHM = 'AES-GCM';
+const KEY_LENGTH = 256;
+
+/**
+ * An object containing encrypted data and necessary metadata for decryption.
+ */
+export interface EncryptedBlob {
+  v: 1;
+  /**
+   * The algorithm used. This is metadata; the actual Web Crypto API call
+   * uses `{ name: "AES-GCM", length: 256 }`.
+   */
+  alg: 'A256GCM';
+  iv_b64: string; // Initialization Vector (base64)
+  ct_b64: string; // Ciphertext (base64)
+}
+
+// --- Core API Functions ---
+
+/**
+ * Generates and stores a session-level AES-GCM 256-bit key.
+ * The key is non-exportable and is held in a private module-level variable.
+ * If a key already exists, the existing key is returned, making the function idempotent.
+ * This function must be called before any encryption or decryption can occur.
+ * @returns A promise that resolves to the generated or existing CryptoKey.
+ */
+export async function getSessionKey(): Promise<CryptoKey> {
+  if (sessionKey) {
+    return sessionKey;
+  }
+
+  const key = await window.crypto.subtle.generateKey(
+    {
+      name: KEY_ALGORITHM,
+      length: KEY_LENGTH,
+    },
+    false, // non-exportable
+    ['encrypt', 'decrypt'],
+  );
+  sessionKey = key;
+  return key;
+}
+
+/**
+ * Encrypts a JSON-serializable object using the current session key.
+ * @param data The object to encrypt. Must be JSON-serializable.
+ * @returns A promise that resolves to an EncryptedBlob.
+ */
+export async function encryptJsonToBlob<T>(data: T): Promise<EncryptedBlob> {
+  if (!sessionKey) {
+    throw new Error('Session key not initialized. Call getSessionKey() first.');
+  }
+
+  const iv = window.crypto.getRandomValues(new Uint8Array(12)); // 96-bit IV is recommended for AES-GCM
+  const plaintext = new TextEncoder().encode(JSON.stringify(data));
+
+  const ciphertext = await window.crypto.subtle.encrypt(
+    {
+      name: KEY_ALGORITHM,
+      iv: new Uint8Array(iv),
+    },
+    sessionKey,
+    plaintext,
+  );
+
+  return {
+    v: 1,
+    alg: 'A256GCM',
+    iv_b64: bytesToBase64(iv),
+    ct_b64: bytesToBase64(new Uint8Array(ciphertext)),
+  };
+}
+
+/**
+ * Decrypts an EncryptedBlob back into its original object form.
+ * @param blob The EncryptedBlob to decrypt.
+ * @returns A promise that resolves to the original decrypted object.
+ */
+export async function decryptBlobToJson<T>(blob: EncryptedBlob): Promise<T> {
+  if (!sessionKey) {
+    throw new Error('Session key not initialized or has been destroyed.');
+  }
+  if (blob.v !== 1 || blob.alg !== 'A256GCM') {
+    throw new Error('Invalid or unsupported encrypted blob format.');
+  }
+
+  const iv = base64ToBytes(blob.iv_b64);
+  const ciphertext = base64ToBytes(blob.ct_b64);
+
+  const decrypted = await window.crypto.subtle.decrypt(
+    {
+      name: KEY_ALGORITHM,
+      iv: new Uint8Array(iv),
+    },
+    sessionKey,
+    new Uint8Array(ciphertext),
+  );
+
+  const jsonString = new TextDecoder().decode(decrypted);
+  return JSON.parse(jsonString) as T;
+}
+
+/**
+ * Destroys the session key reference, making it unavailable for future
+ * operations and allowing it to be garbage collected.
+ */
+export function destroySessionKey(): void {
+  sessionKey = null;
+}
+
+/**
+ * A standalone test function that can be run in the browser console
+ * to verify the complete encryption and decryption lifecycle.
+ *
+ * To use:
+ * 1. Copy this entire function into the browser's developer console.
+ * 2. Run it by typing: `await runSessionCryptoTest()`
+ * 3. Check the console for logs.
+ */
+export async function runSessionCryptoTest(): Promise<void> {
+  console.log('--- Running Session Crypto Test ---');
+  try {
+    // 1. Destroy any old key
+    destroySessionKey();
+    console.log('Old key destroyed (if any).');
+
+    // 2. Generate a new key
+    await getSessionKey();
+    console.log('New session key generated.');
+
+    // 3. Define a secret object
+    const originalObject = {
+      mnemonic: 'fee table visa input phrase lake buffalo vague merit million mesh blend',
+      timestamp: new Date().toISOString(),
+    };
+    console.log('Original object:', originalObject);
+
+    // 4. Encrypt the object
+    const encrypted = await encryptJsonToBlob(originalObject);
+    console.log('Encrypted blob:', encrypted);
+    if (typeof encrypted.ct_b64 !== 'string' || encrypted.ct_b64.length < 20) {
+      throw new Error('Encryption failed: ciphertext looks invalid.');
+    }
+
+    // 5. Decrypt the object
+    const decrypted = await decryptBlobToJson(encrypted);
+    console.log('Decrypted object:', decrypted);
+
+    // 6. Verify integrity
+    if (JSON.stringify(originalObject) !== JSON.stringify(decrypted)) {
+      throw new Error('Verification failed: Decrypted data does not match original data.');
+    }
+    console.log('%c✅ Success: Data integrity verified.', 'color: green; font-weight: bold;');
+
+    // 7. Test key destruction
+    destroySessionKey();
+    console.log('Session key destroyed.');
+    try {
+      await decryptBlobToJson(encrypted);
+    } catch (e) {
+      console.log('As expected, decryption failed after key destruction:', (e as Error).message);
+    }
+  } catch (error) {
+    console.error('%c❌ Test Failed:', 'color: red; font-weight: bold;', error);
+  } finally {
+    console.log('--- Test Complete ---');
+  }
+}
+
+// For convenience, attach the test runner to the window object.
+// This is for development/testing only and can be removed in production.
+if (import.meta.env.DEV && typeof window !== 'undefined') {
+  (window as any).runSessionCryptoTest = runSessionCryptoTest;
+}
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -1,8 +1,32 @@
+// Suppress OpenPGP.js AES cipher warnings
+const originalWarn = console.warn;
+const originalError = console.error;
+
+console.warn = (...args: any[]) => {
+  const msg = args[0]?.toString() || '';
+  if (msg.includes('AES-CBC') || msg.includes('AES-CTR') || msg.includes('authentication')) {
+    return;
+  }
+  originalWarn.apply(console, args);
+};
+
+console.error = (...args: any[]) => {
+  const msg = args[0]?.toString() || '';
+  if (msg.includes('AES-CBC') || msg.includes('AES-CTR') || msg.includes('authentication')) {
+    return;
+  }
+  originalError.apply(console, args);
+};
+
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import './index.css'
 import App from './App'

+if (import.meta.env.DEV) {
+  await import('./lib/sessionCrypto');
+}
+
 createRoot(document.getElementById('root')!).render(
  <StrictMode>
    <App />
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -0,0 +1,10 @@
+/// <reference types="vite/client" />
+
+// Allow importing CSS files
+declare module '*.css' {
+  const content: string;
+  export default content;
+}
+
+declare const __APP_VERSION__: string;
+declare const __BUILD_HASH__: string;
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,6 +1,24 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import { execSync } from 'child_process'
+import fs from 'fs'
+
+// Read version from package.json
+const packageJson = JSON.parse(fs.readFileSync('./package.json', 'utf-8'))
+const appVersion = packageJson.version
+
+// Get git commit hash
+const gitHash = execSync('git rev-parse --short HEAD').toString().trim()

 export default defineConfig({
  plugins: [react()],
+  base: '/seedpgp-web-app/',
+  build: {
+    outDir: 'dist',
+    emptyOutDir: false,
+  },
+  define: {
+    '__APP_VERSION__': JSON.stringify(appVersion),
+    '__BUILD_HASH__': JSON.stringify(gitHash),
+  }
 })
Author	SHA1	Message	Date
LC mac	9ffdbbd50f	feat(v1.4): Add 'Encrypted in memory' badge	2026-01-30 01:21:28 +08:00
LC mac	b024856c08	docs: update GEMINI.md for v1.4.0 + remove debug logs	2026-01-30 00:44:46 +08:00
LC mac	a919e8bf09	chore: small fix in 1.4.0	2026-01-30 00:36:09 +08:00
LC mac	e4516f3d19	chore: bump version to 1.4.0	2026-01-30 00:35:00 +08:00
LC mac	4b5bd80be6	feat(v1.3.0): ephemeral session-key encryption + cleanup - Update version to 1.3.0 - Remove debug console logs - Session-key encryption working in production - Mnemonic auto-clears after QR generation - Lock/Clear functionality verified	2026-01-30 00:08:43 +08:00
LC mac	8124375537	debug: add console logs to sessionCrypto for troubleshooting	2026-01-30 00:01:02 +08:00
LC mac	2107dab501	feat(v1.3.0): add ephemeral session-key encryption for sensitive state - Add src/lib/sessionCrypto.ts with AES-GCM-256 non-exportable session keys - Integrate into Backup flow: auto-clear plaintext mnemonic after QR generation - Add Lock/Clear button to destroy session key and clear all state - Add cleanup useEffect on component unmount - Add comprehensive GEMINI.md for AI agent onboarding - Fix TypeScript strict mode errors and unused imports Tested: - Session-key encryption working (mnemonic clears after QR gen) - Lock/Clear functionality verified - No plaintext secrets in localStorage/sessionStorage - Production build successful	2026-01-29 23:48:21 +08:00
LC mac	0f397859e6	feat(v1.3.0): add ephemeral session-key encryption for sensitive state - Add src/lib/sessionCrypto.ts with AES-GCM-256 session keys - Integrate into Backup flow: auto-clear plaintext mnemonic after QR gen - Add Lock/Clear button to destroy key and clear all state - Add cleanup on component unmount - Fix unused imports and TypeScript strict mode errors	2026-01-29 23:35:08 +08:00
LC mac	d4919f3d93	docs: add comprehensive GEMINI.md for AI agent onboarding (v1.3.0)	2026-01-29 23:34:23 +08:00
LC mac	c1b1f566df	Fix: Resolve type incompatibility errors in sessionCrypto.ts	2026-01-29 23:24:57 +08:00
LC mac	6bbfe665cd	bug fix app.tsx	2026-01-29 23:18:29 +08:00
LC mac	8e656749fe	feat(v1.3.0): add ephemeral session-key encryption for sensitive state	2026-01-29 23:14:42 +08:00
LC mac	5a4018dcfe	feat(v1.2.1): add security monitoring components - Add Storage Indicator (browser localStorage/sessionStorage monitor) - Add Security Warnings (educational panel on JS limitations) - Add Clipboard Tracker (copy event detection with clear function) - Add data-sensitive attributes to sensitive fields Security Features: - Real-time storage monitoring with sensitive data highlighting - Clipboard activity tracking with character count - System clipboard clearing functionality - Collapsible floating widgets (non-intrusive) - Auto-refresh storage display every 2s - Educational warnings about GC, string immutability, etc. UI/UX: - Floating widgets: Storage (bottom-right), Warnings (bottom-left), Clipboard (bottom-right stacked) - Color-coded alerts (red=sensitive, orange=activity, yellow=warnings) - Responsive and clean design with TailwindCSS	2026-01-29 01:20:50 +08:00
LC mac	94764248d0	docs: update public README for v1.2.0	2026-01-29 00:36:00 +08:00
LC mac	a4a737540a	feat(v1.2.0): add QR scanner with camera/upload support - Add QRScanner component with camera and image upload - Add QR code download button with auto-naming (SeedPGP_DATE_TIME.png) - Split state for backup/restore (separate public/private keys and passwords) - Improve QR generation settings (margin: 4, errorCorrection: M) - Fix Safari camera permissions and Continuity Camera support - Add React timing fix for Html5Qrcode initialization - Configure Vite for GitHub Pages deployment - Update deploy script for dist as public repo - Update public README for v1.2.0 features Features: - Camera scanning with live preview and Continuity Camera - Image file upload scanning - Automatic SEEDPGP1 validation - 512x512px high-quality QR generation with download - User-friendly error messages	2026-01-29 00:33:09 +08:00
LC mac	b7da81c5d4	chore: configure vite for GitHub Pages deployment	2026-01-29 00:21:26 +08:00
LC mac	c55390228b	feat(v1.2.0): add QR scanner with camera/upload support - Add QRScanner component with camera and image upload - Add QR code download button with auto-naming (SeedPGP_DATE_TIME.png) - Split state for backup/restore (separate public/private keys and passwords) - Improve QR generation settings (margin: 4, errorCorrection: M) - Fix Safari camera permissions and Continuity Camera support - Add React timing fix for Html5Qrcode initialization Features: - Camera scanning with live preview - Image file upload scanning - Automatic SEEDPGP1 validation - User-friendly error messages - 512x512px high-quality QR generation	2026-01-28 23:54:02 +08:00
LC mac	3285bc383e	update deploy script - add note	2026-01-28 12:54:52 +08:00
LC mac	307a97516a	docs: add deployment repo README	2026-01-28 12:49:09 +08:00
LC mac	b1d3406cc7	docs: add GitHub Pages deployment guide	2026-01-28 12:36:13 +08:00
kccleoc	a96b39bb62	Update README.md small format change	2026-01-28 12:33:24 +08:00
kccleoc	7d49f9cffd	Update README.md docs: add GitHub Pages deployment guide	2026-01-28 12:32:26 +08:00
LC mac	24f50014af	update vite.config.ts	2026-01-28 12:28:10 +08:00
LC mac	b2be6d381c	add build file vite-env.d.ts	2026-01-28 12:25:18 +08:00
kccleoc	34633af539	Update and rename _GPT-Suggestion.md to DEVELOPMENT.md	2026-01-28 02:56:26 +08:00
LC mac	2959b44e39	docs: add comprehensive README for v1.1.0	2026-01-28 02:47:37 +08:00