DJCCMT

A SECURE WEB-BASED REAL-TIME MESSENGER USING AES-RSA ENCRYPTION

૴ĸe exponential growth of web‑based communication platforms has heightened the urgency of protecting message confidentiality and integrity against increasingly sophisticated cyber‑attacks. While symmetric ciphers such as the Advanced Encryption Standard (AES) offer high performance, their secure key‑exchange remains a challenge in open networks. Conversely, asymmetric schemes like Rivest–Shamir–Adleman (RSA) ensure secure key distribution but suffer from computational overhead when encrypting large payloads. This paper presents the design and implementation of a secure, real‑time web messenger that leverages a hybrid AES–RSA encryption workflow to combine the low‑latency benefits of AES for message payloads with the robust key‑exchange properties of RSA. Our system is underpinned by an Event‑Driven Architecture (EDA) and a functional‑oriented analysis model, enabling modular, scalable, and responsive message handling over WebSocket connections. We describe the end‑to‑end encryption lifecycle—RSA‑protected AES key negotiation, AES‑encrypted message exchange, and seamless key rotation—within a modern browser–server stack. Performance benchmarks demonstrate end‑to‑end latency under 50 ms for typical text payloads, with negligible CPU impact on commodity hardware. Security analysis confirms resistance to man‑in‑the‑middle, replay, and brute‑force attacks. The proposed architecture thus delivers a practical blueprint for high‑throughput, real‑time messaging with enterprise‑grade confidentiality.