Welcome to Nexa, a decentralized peer-to-peer messaging application with end-to-end encryption and temporary offline storage.
Nexa is composed of:
- A bootstrap server (Node.js) that helps clients discover active peers.
- Relay nodes (Python) that forward messages between clients and store them temporarily if the recipient is offline.
- Clients: a desktop interface in Python (Tkinter) and a mobile client built with React Native.
- 🔒 End-to-End Encryption (ECIES): Implemented in the PC client to secure your messages. Nodes only relay encrypted messages.
- 🌐 Peer-to-Peer Network: No central message server. Clients connect to random nodes in the network.
- 🛰️ Bootstrap Discovery API: Lightweight HTTP API to discover available nodes.
- 🗃️ Offline Storage: Messages are temporarily stored if the recipient is not connected.
- 💬 Multi-platform Clients: Desktop interface in Python (Tkinter) and a mobile app in React Native.
- Languages: Python 🐍, Node.js 🟩, JavaScript (React Native) 📱
- Protocols: WebSockets 🔌, HTTP REST 🌐
- Encryption: ECIES (Elliptic Curve Integrated Encryption Scheme) 🔐
- Databases: SQLite 🗄️
- UI: Tkinter (PC), React Native + Expo (Mobile)
To get started with the different components of Nexa (bootstrap server, relay nodes, clients), please refer to the requirements.txt file in the respective directories. It contains the necessary setup instructions and dependencies for each part of the application.
This project is actively developed as part of a group assignment for L1 CMI Informatique. It is maintained by a team of four students.
Feel free to fork this repo and submit pull requests. Help us improve Nexa and make secure communication accessible to everyone!
This project is open-source and free to use! You are welcome to modify and distribute it as you wish.