Block-Crypt Chat: Secure Messaging Reinvented With Blockchain and Real - Time Encryption

Abstract

The increasing demand for secure and trustworthy digital communication necessitates advanced solutions beyond traditional centralized messaging systems. This paper proposes a blockchain-enabled secure messaging framework that integrates hybrid RSA-AES encryption with real-time communication mechanisms. The system ensures end-to-end confidentiality by performing client-side encryption, while message integrity is maintained through SHA-256 hash logging on a blockchain, enabling tamper-proof verification without revealing message content. Additionally, a PIN-based secure file-sharing mechanism enhances data protection. The proposed model is implemented using a modern web-based architecture and evaluated for performance and security. Experimental results indicate low latency, strong data protection, and improved transparency compared to existing systems. The framework demonstrates scalability and practical applicability in sensitive domains such as enterprise communication, education, and legal environments.