Secure Diffie-Hellman Key Exchange with AES Encryption in Python: A Step-by-Step Guide

In modern cryptography, secure communication over an insecure network is crucial. One of the most widely used methods to achieve this is the Diffie-Hellman (DH) Key Exchange , which allows two parties to establish a shared secret key without transmitting it directly. However, this key exchange mechanism alone does not provide encryption. To ensure confidentiality, we can use AES (Advanced Encryption Standard) to encrypt and decrypt messages using the shared key. This guide will walk you through implementing a secure Diffie-Hellman key exchange in Python, followed by using the exchanged key for AES encryption and decryption . By the end of this tutorial, you'll have a solid understanding of how to: Generate a shared secret key securely using Diffie-Hellman . Derive a symmetric key from the shared secret using SHA-256 . Encrypt and decrypt messages using AES in CBC mode Step 1: Install Required Libraries pip install pycryptodome The pycryptodome library provides AES encryption fu...