Group Signature Authentication Scheme with Credit Evaluation Mechanism in VANET

Aiming at the problems of privacy disclosure and false information provided by malicious vehicles in vehicular ad-hoc network (VANET) communication, this paper proposes a group signature authentication scheme with credit evaluation mechanism combining certificateless public key cryptography and group signature technology. In this scheme, the problem of certificate management and key escrow were solved by using certificateless public key cryptography; secondly, used group signature technology, any member of the group could sign the message anonymously on behalf of the group to protect the private information of the vehicle; finally, a single factor weight evaluation mechanism and a reward and punishment mechanism were introduced to evaluate the reliability of shared information and encourage users to share real information. Based on the computational Diffie-Hellman difficult problem, the scheme is proved to satisfy the security of signature unforgeability under the random oracle model. Compared with the existing schemes, the experimental results show that the scheme reduces the time of vehicle signature by 10.82%~45.95%, and the time of group administrator verification by 4.87%~30.09%, which proves that the scheme is more effective.