#hello (HashHello)

A secure, end-to-end encrypted P2P messenger running entirely in the browser.

Live Demo: https://hashhello.vercel.app

Test Contact: You can message me at #333 831 177

Important: To establish a P2P connection, the target number must be online and have the website open at the same time.

Features

• Identity: Your "Phone Number" (e.g., #600 500 600) is cryptographically derived from your Public Key.
• Security:
  • End-to-End Encryption using AES-GCM (256-bit).
  • Perfect Forward Secrecy (per session keys via ECDH).
  • Identity Verification (Handshake verifies that the peer owns the private key corresponding to the phone number).
• Privacy: No central database of messages. Communication is direct P2P via WebRTC.
• Multi-chat: Support for multiple simultaneous encrypted conversations.
• Media: Securely send and receive images (encrypted with the same session keys).

Tech Stack

• Framework: Next.js 14
• P2P: PeerJS (WebRTC wrapper)
• Crypto: Web Crypto API (Native browser cryptography)
• Styling: Tailwind CSS

Getting Started

1. Install dependencies:

   npm install

2. Run the development server:

   npm run dev

3. Open http://localhost:3000 in two different browser windows (or use Incognito mode for the second one).

How to use

1. Window A: Click "NEW IDENTITY". Copy your Private Key (save it if you want to login later). Note your Number (e.g., #123 456 789).
2. Window B: Click "NEW IDENTITY" to get a different number.
3. Window A: Enter Window B's number in the top bar and click "DIAL".
4. Chat: Once the "CONNECTED" status appears (and the shield icon turns green), the secure channel is established.

Security Note

This is a prototype. The "Phone Number" is a hash of the public key. In a production system, you would need a larger address space or a distributed hash table (DHT) to prevent collisions, although with 9 digits collisions are rare for small groups.