ChatSecureV2

A full-stack, end-to-end encrypted chat application with real-time messaging, built with Node.js/Express and React/Vite.

It uses JWT for authentication(access,refresh token), AES for encryption and ECDH for Asynchronous keys exchange.

View Live app here

ChatSecureV1 can be found here

 

Table of Contents

• Features
• Tech Stack
• Installation
• Credits
• Contribution

Features

End-to-End Encryption: AES encryption with Diffie–Hellman–derived shared secrets.

Simultaneous Key Exchange: Both clients broadcast public keys immediately to reduce handshake latency.

Real-Time Messaging: Powered by Socket.IO.

Ephemeral Message Storage: Messages are stored on server until delivery (or up to 15 days if undelivered).

User Authentication: JWT-based sessions with bcrypt-hashed passwords.

Group & Private Chats

Offline Support: IndexedDB caching with Dexie.js.

Tech Stack

Backend: Node.js, Express, Mongoose, Socket.IO

Frontend: React, Vite, Tailwind CSS, DaisyUI, Zustand

Database: MongoDB

Auth & Security: bcrypt, JSON Web Tokens, dotenv

Offline Caching: Dexie.js

Installation

Prerequisites

Node.js v16+

npm v8+

MongoDB instance (local or cloud)

Setup

git clone https://github.com/Yoganand20/ChatSecureV2.git
cd ChatSecureV2

Backend

cd backend-cs2
npm install

Frontend

cd ../frontend-cs2
npm install

Configuration

Create a .env file in backend-cs2/:

PORT=5005

MONGODB_URI=<your_mongodb_uri>

JWT_ACCESS_SECRET=<your_jwt_access_secret>
JWT_REFRESH_SECRET=<your_jwt_refresh_secret>

JWT_ACCESS_EXPIRE=<your_jwt_access_expiry>
JWT_REFRESH_EXPIRE=<your_jwt_refresh_expiry>

BCRYPT_ROUNDS=<cost_factor_of_bcrypt_salt_gen>

NODE_ENV=<"development"||"production">

Usage

Start the Backend

cd backend-cs2
npm run dev

Start the Frontend

cd frontend-cs2
npm run dev

Open your browser at http://localhost:5173.

Screenshots

Login Screen

Chat Interface

New Chat Modal

License

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