An Efficient Encryption and Verification Scheme for Preserving Electronic Evidence in Cloud Computing

摘要

Electronic evidence is more likely to be deleted, forged, modified and damaged than traditional evidence on local storage or remote transmission. Also, Due to the dynamic and virtual operation nature of cloud computing, the preservation of electronic evidence in cloud is more complex and difficult than traditional computing environment. We propose an efficient encryption and verification scheme to preserve electronic evidence in cloud computing. In our scheme, it constructs a Chaos Block Encryption Algorithm (CBEA) to encrypt electronic evidence, and sends cipher evidence to the Cloud Storage Server (CSS). Then, it designs a Homomorphic Signature Algorithm (HSA) to establish a challenge and verification protocol, and the user can use this protocol to verify that the CSS holds cipher evidence intact. Experiment and security analysis show our scheme can ensure the confidentiality of electronic evidence in cloud with fast encryption/decryption speed, and can offer a double integrity verification guarantee for electronic evidence in cloud with low communication and computational costs.