🚀 LetShare - Lightning-Fast Secure File Sharing

Zero Registration | End-to-End Encrypted | Instant P2P Transfer | Cross-Platform

🇨🇳 中文版

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🎯 Why LetShare?

❌ Traditional file sharing pain points:

• Upload to cloud servers → Privacy risks & slow speeds
• Registration required → Friction and data collection
• Platform limitations → iPhone ↔ Android struggles
• File size restrictions → Can't share what you need

✅ LetShare solves it all:

• 🚀 Direct P2P transfer - Your network speed = transfer speed
• 🔐 Military-grade encryption - Even we can't see your files
• 📱 Universal compatibility - Any device, any platform
• ⚡ Instant connection - Scan QR code, start sharing

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✨ Core Features

🔐 Enterprise-Grade Security

• End-to-End Encryption: ECDH + AES-256-GCM
• Digital Signatures: ECDSA verification prevents tampering
• Anti-MITM Protection: Public key signature validation
• Zero Server Storage: Files never touch our servers

⚡ Lightning Performance

• WebRTC P2P: Direct device-to-device connection
• No Upload Delays: Skip the cloud, transfer directly
• Unlimited File Size: Only limited by your storage
• Real-time Progress: Live transfer monitoring

🌍 Universal Compatibility

• Web Browser: Chrome, Firefox, Safari, Edge
• Mobile Native: Android app via Capacitor
• Cross-Platform: Windows ↔ Mac ↔ Linux ↔ Mobile
• PWA Support: Install as native app

🎯 Zero Friction Experience

• No Registration: Open and use immediately
• QR Code Pairing: Scan to connect instantly
• Drag & Drop: Intuitive file sharing
• Multi-language: English, 中文, Bahasa, Indonesia

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🎬 See It In Action

🔥 30-Second Workflow:

1. Open LetShare on both devices
2. Scan QR code to connect
3. Drag files or paste text
4. Watch encrypted transfer in real-time

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🏗️ Technical Architecture

graph TB
    A[Device A] -->|ECDH Key Exchange| B[Device B]
    A -->|AES-256-GCM Encrypted Data| B
    A -->|WebRTC P2P Channel| B
    
    C[Signaling Server] -.->|Connection Setup Only| A
    C -.->|No File Access| B
    
    subgraph "Security Layer"
        D[Digital Signature]
        E[Timestamp Validation]
        F[Replay Attack Prevention]
    end

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🔧 Tech Stack Highlights:

• Frontend: React 18 + TypeScript + Vite
• P2P: WebRTC DataChannels
• Encryption: Web Crypto API (ECDH/ECDSA/AES-GCM)
• UI: Material-UI (MUI) 5
• State: MobX for reactive updates
• Mobile: Capacitor for native apps
• I18n: react-i18next with auto-detection

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🚀 Quick Start

🌐 Try Online (Recommended)

👉 Visit: https://letshare.fun

No installation needed - works instantly in any modern browser!

💻 Local Development

# Clone the repository
git clone https://github.com/LiWeny16/LetShare.git
cd LetShare

# Install dependencies
yarn install

# Start development server
yarn dev

# Build for production
yarn build

📱 Build Android App

# Setup Capacitor
yarn app-create

# Build and sync
yarn app

# Open in Android Studio
yarn app-start

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🔐 Security Features {#security}

Encryption Pipeline

1. Key Generation: ECDH P-256 key pairs per user
2. Key Exchange: Signed public key distribution
3. Shared Secret: ECDH-derived AES-256 keys
4. Message Encryption: AES-256-GCM with authentication
5. Integrity: ECDSA signatures prevent tampering

Attack Protection

• ✅ Man-in-the-Middle: Public key signature validation
• ✅ Replay Attacks: Timestamp + nonce verification
• ✅ Data Tampering: Cryptographic authentication
• ✅ Eavesdropping: End-to-end encryption

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📊 Comparison Matrix

Feature	LetShare	AirDrop	WeTransfer	Google Drive
Cross-Platform	✅ Universal	❌ Apple Only	✅ Web	✅ Web
Privacy	✅ E2E Encrypted	✅ Local	❌ Server Access	❌ Server Scan
Speed	✅ P2P Direct	✅ Local	❌ Upload/Download	❌ Rate Limited
File Size	✅ Unlimited*	❌ Limited	❌ 2GB Max	❌ 15GB Quota
Registration	✅ None	✅ None	❌ Required	❌ Required
Offline	✅ LAN Works	✅ Local	❌ Internet Only	❌ Internet Only

*Limited by device storage and network stability

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🌍 Supported Platforms

Web Browsers

• ✅ Chrome 88+ (Recommended)
• ✅ Firefox 84+
• ✅ Safari 14+
• ✅ Edge 88+

Mobile Platforms

• ✅ Android 7.0+ (Native app)
• ✅ iOS 14+ (PWA)
• ✅ Any mobile browser

Desktop OS

• ✅ Windows 10+
• ✅ macOS 10.15+
• ✅ Linux (Any distribution)

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🛠️ Development Scripts

yarn dev
yarn build       

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🤝 Contributing

We welcome contributions! Here's how you can help:

🐛 Found a Bug?

• Open an issue with reproduction steps

💡 Have Ideas?

• Check our roadmap
• Suggest features in discussions

🚀 Want to Contribute Code?

1. Fork the repository
2. Create your feature branch: git checkout -b feature/amazing-feature
3. Commit changes: git commit -m 'Add amazing feature'
4. Push to branch: git push origin feature/amazing-feature
5. Open a Pull Request

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📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

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⭐ Support This Project

If LetShare helps you, please consider:

• ⭐ Star this repository to show your support
• 🐛 Report bugs to help us improve
• 💡 Share ideas for new features
• 🔄 Share with friends who need secure file sharing
• ☕ Buy us a coffee to fuel development

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🔗 Links

• 🌐 Live Demo: letshare.fun
• 📱 Android App: Google Play Store
• 📧 Contact: hello@letshare.fun

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Built with ❤️ by developers who believe in privacy and simplicity

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