Blockchain-Based Secure Video Data Protection Framework Enhanced with National Cryptographic Algorithms

Abstract

This paper proposes a blockchain-based security protection framework for video data, integrating the SM2, SM3, and SM4 algorithms to achieve high-level data integrity, privacy, and reliability. The framework addresses the vulnerabilities of traditional centralized storage, such as single-point failures and tampering risks, by employing a consortium blockchain architecture with distributed storage and multi-node consensus mechanisms. The SM4 algorithm is used for data encryption and storage, SM2 for identity authentication and digital signatures, and SM3 for hash computation and traceability. Through the integration of smart contracts, the system achieves fine-grained access control and end-to-end auditability, ensuring that only authorized entities can access or modify video data. Experimental implementation on a four-node consortium chain demonstrates secure data transmission, verifiable access records, and efficient consensus execution. The proposed framework significantly enhances the reliability, transparency, and security of video surveillance systems and shows broad potential for application in smart city management, public safety, and industrial monitoring.