Blockchain-Based Access Control Mechanism in Electronic Evidence

With rapid development of the information age, the proportion of electronic evidence involved in judicial cases has been rising, and the importance of electronic evidence is increasingly prominent. In the real judicial process, there are strict requirements put forward for the authenticity identification, tamper proof storage and legal sharing methods of electronic evidence, bringing many security challenges. If such conditions are not met, the legal force of electronic evidence will be seriously reduced. However, the existing technical solutions can not meet these above requirements. Blockchain technology has the characteristics of decentralization and tamper proof, which provides a new method for the storage and extraction of electronic evidence. To solve these problems, this paper proposes a blockchain-based storage access control model for electronic evidence and designs the corresponding storage access control protocol. In this scheme, multi-entity cooperation is allowed to store evidence, and a zero-knowledge proof protocol is applied to achieve access control and data sharing. Through the security and experimental analysis, it can be proved that the scheme satisfies security features such as known key security and non-repudiation, and can effectively resist collusion, camouflage, replay and man-in-the-middle attacks. Finally, related experiments show that the scheme has high computational and communication efficiency. In this way, the problem of secure storage and sharing of electronic evidence will be resolved commendably, which meets the security requirements in actual scene.