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Secure Chat Encryption

Mar — Jun 2025

Overview

A layered message-encryption exploration combining Vigenère Cipher, AES-128 CBC, and RC4 for secure, real-time-friendly chat communication.

Background

An exploratory cryptography project comparing classical and modern encryption approaches to understand the trade-off between speed and security in real-time communication.

Problem Statement

Chat messages sent as plaintext are vulnerable to interception, but encryption methods strong enough to be secure can also be too slow for real-time communication.

Objectives

  • Apply Vigenère Cipher for basic key-based message encryption.
  • Use AES-128 CBC for strong, standards-based message protection.
  • Integrate RC4 as a lightweight cipher for fast, real-time exchanges.