Peer-to-Peer Encrypted Messaging System

This project is a secure, peer-to-peer encrypted messaging system built with Python. It includes features for user registration, login, message encryption/decryption, and secure key management.

Features

• User Authentication: Registration and login functionalities with password hashing.
• Public/Private Key Encryption: RSA keys are generated for each user to encrypt and sign messages.
• Message Encryption: Messages are securely encrypted with RSA and stored in a database.
• Persistent Data: Encrypted user data and messages are stored locally and on the server.

Prerequisites

• Only for Linux at the moment
• Python 3.8+
• SQLite (for local database management)

Installation

Clone the Repository

git clone https://github.com/Enryou/BCYB_Project.git

Set Up the Python Environment

1. Create a virtual environment:

   python -m venv venv

2. Activate the virtual environment:

   source venv/bin/activate

3. Install dependencies:

   pip install -r requirements.txt

Set Up the Database

1. Run the database_manager.py script to initialize the SQLite database:

   python database_manager.py

   This will create a messages.db file in the project directory.

Running the Server

1. Start the server by running:

   uvicorn server_routes:app --reload

   The server will be accessible at http://127.0.0.1:8000.

Running the Client

1. Run the client application:

   python client.py

How It Works

Registration

• Users register with a username and password.
• A pair of RSA keys (private and public) is generated.
• The private key is encrypted with the user's password and stored locally.
• The public key is uploaded to the server.

Login

• Users log in with their credentials.
• The private key and secret key are loaded and decrypted locally.

Sending Messages

• Messages are encrypted using the recipient's public key.
• The message and a digital signature are sent to the server.
• The server stores the encrypted message.

Receiving Messages

• Messages are retrieved from the server.
• The client decrypts the messages using the user's private key.
• Digital signatures are verified to ensure authenticity.

Usage

Client Menu Options

1. Register: Register a new user.
2. Login: Log in with an existing username and password.
3. Send Message: Send an encrypted message to another user.
4. Get Messages: Retrieve messages sent to the logged-in user.
5. View Past Messages: View decrypted past messages stored locally.
6. Logout: Logout from the current session.

Security Features

• Password Validation: Passwords must meet strict complexity requirements.
• Encryption: RSA for key encryption and message exchange.
• Signature Verification: Ensures message integrity and authenticity.

File Overview

• client.py: Handles user interaction, encryption, and communication with the server.
• server_routes.py: Defines API routes for user registration, login, and message exchange.
• database_manager.py: Manages the SQLite database and ORM models.
• requirements.txt: Lists all the dependencies required for the project.