🔒 HashChat | End-to-End Encrypted Anonymous Chat App

Serverless, No-Login, Ephemeral Messaging built with Web Crypto API

A privacy-first, zero-setup burner chat application. Generate an instant room, share the encrypted link, and communicate securely. When the tab closes, the history vanishes forever.

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Live Demo • Features • How It Works • Tech Stack • Setup

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🔥 Key Features

🔐 True End-to-End Encryption (E2EE)

Messages are locked using the browser's native Web Crypto API (AES-GCM) before they ever leave your device. The room's URL hash acts as the cryptographic key. Even the database administrator (or Firebase) only sees randomized gibberish.

🗑️ Ephemeral & Burner-Ready (Zero Trace)

Designed for pure, untraceable communication. Messages are completely ephemeral—they exist only in memory. Closing the browser tab instantly purges the chat. No server logs, no database history, no evidence.

👤 100% Anonymous (No Login Required)

No emails, no phone numbers, no OAuth, and no IP logging. Just click generate and start typing.

⚡ Real-Time Serverless Architecture

Powered by Firebase Realtime Database for instantaneous WebSocket message delivery without the need to maintain a traditional backend server.

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📖 How It Works

┌─────────────┐ ┌─────────────┐ ┌─────────────┐
│ 1. Generate │────▶│ 2. Invite │────▶│ 3. Vanish │
└─────────────┘ └─────────────┘ └─────────────┘
│ │ │
▼ ▼ ▼
Create unique Share the hash Close tab &
AES-GCM Key with your peer messages vanish

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🛠 Tech Stack

Technology	Purpose
	Structure
	Styling
	Logic & Interactivity
	Real-time Database & Sync

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🚀 Setup

Prerequisites

• A modern web browser (Chrome, Firefox, Safari, Edge)
• A Firebase account (for database configuration)

Installation

1. Clone the repository

git clone https://github.com/yourusername/hashchat.git
cd hashchat

2. Configure Firebase

   • Create a project at Firebase Console
   • Enable Realtime Database
   • Copy your Firebase config:

constfirebaseConfig={apiKey: "YOUR_API_KEY",authDomain: "YOUR_PROJECT.firebaseapp.com",projectId: "YOUR_PROJECT_ID",storageBucket: "YOUR_PROJECT.appspot.com",messagingSenderId: "YOUR_SENDER_ID",appId: "YOUR_APP_ID"};

3. Update the config

   Open index.html and replace the Firebase config with your own:

constfirebaseConfig={// Your config here};

4. Run locally

   Simply open index.html in your browser, or use a local server:

# Using Python
python -m http.server 8000
# Using Node.js
npx serve

5. Deploy

   Deploy to any static hosting service:

   • Vercel
   • Netlify
   • GitHub Pages

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📁 Project Structure

hashchat/
├── index.html # Main HTML file with all structure
├── script.js # JavaScript logic (encryption, Firebase, chat)
├── stylesheet.css # All styling (dark theme, animations)
└── README.md # This file

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🔐 Security Notes

• Messages are end-to-end encrypted before being stored in Firebase Realtime Database
• Each room has a unique hash that acts as the room ID
• The encryption key is derived from the room URL - only those with the link can decrypt messages
• No user authentication — anyone with the link can join
• Messages are removed from memory when the tab is closed
• Even Firebase cannot read your message contents - they are stored as encrypted data
• For production use, consider implementing additional security rules in Firebase

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🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the 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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🙏 Acknowledgments

• Firebase for the real-time database
• Space Grotesk font by Google Fonts
• Inspired by privacy-first messaging apps

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Made with 🔒 for private conversations

HashChat — When you're done, it's gone.