Secure Communication with MQTT and RSA Encryption

This project implements a secure messaging application that integrates MQTT for real-time communication and RSA encryption to ensure the privacy and security of messages. The application includes a user-friendly graphical interface (GUI) to facilitate secure communication between multiple clients.

Features

• End-to-End Encryption: Ensures secure message delivery using RSA encryption.
• Real-Time Communication: Utilizes the MQTT protocol for fast and efficient message delivery.
• RSA Key Management:
  • Each client generates its own RSA key pair.
  • Private keys are stored locally for enhanced security.
  • Public keys are shared with other clients for encrypted communication.
• Graphical User Interface (GUI):
  • Allows users to generate RSA keys, send encrypted messages, and receive/decrypt incoming messages.
  • Displays chat history for each client.
• Error Handling: Includes validation for message delivery and recipient errors.

Technologies Used

• Programming Language: Python
• Messaging Protocol: MQTT (with paho-mqtt library)
• Encryption: RSA (with the cryptography package)
• GUI Framework: Tkinter for cross-platform graphical user interfaces.

How It Works

1. Key Generation:
   • Each client generates its own RSA key pair.
   • Public keys are exchanged among clients.
2. Message Encryption:
   • Messages are encrypted using the recipient's public key.
   • Only the recipient can decrypt the message with their private key.
3. Message Transmission:
   • Messages are sent over MQTT topics.
   • Each client subscribes to its designated topic to receive messages.
4. Message Decryption:
   • Received messages are decrypted using the recipient's private key.

Setup Instructions

1. Clone the repository:

   git clone https://github.com/username/secure-mqtt-rsa
   cd secure-mqtt-rsa

Install required dependencies: **pip install paho-mqtt cryptography

Run the application:

python client1.py python client2.py python client3.py python rsakey.py python display.py

Future Enhancements Add support for secure file sharing between clients. Introduce multi-factor authentication (MFA) for additional security. Expand the project to include voice and video communication.

Screenshots (Include relevant screenshots of the GUI and message flow here)