🔐 Python End-to-End (E2E) Encryption Demo

Python E2E Encryption Demo is a simple project to show how end-to-end encryption works using public-private key pairs. Messages sent from User A to User B remain private — even the server cannot read them.

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✨ Features

• Generate public and private keys for each user.
• Encrypt messages with the receiver’s public key.
• Decrypt messages with the receiver’s private key.
• Demonstrates the core concept of E2E encryption in a simple way.

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🛠️ How It Works

1. Key Generation Each user creates their own public and private key pair.

2. Message Encryption Sender encrypts the message using the receiver’s public key.

3. Message Decryption Receiver decrypts the message using their private key.

4. Privacy Even if the message is intercepted, it cannot be read without the receiver’s private key.

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📦 Example Usage

1. Generate keys for User A and User B.
2. User A encrypts a message using User B’s public key.
3. User B decrypts the message using their private key.
4. User B can reply securely using User A’s public key.

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🏃 How to Run

1. Start the server:

python main.py server

2. Start a client:

python main.py client

3. Follow the prompts to send encrypted messages between clients.

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🖼️ Flow Diagram

User A (sender)         Server           User B (receiver)
  Public/Private Key                         Public/Private Key
          |                                     |
          | Encrypt message using B's public key
          |----------------------------------->|
          |                                 Receive encrypted message
          |                                     |
          |                                 Decrypt using B's private key
          |                                     |
       Plain message                        Plain message

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⚠️ Notes

• This project is for learning purposes only.
• For real-world security, use a trusted crypto library.