A Privacy-Preserving Authentication and Pseudonym Revocation Scheme for VANETs

With the development of Intelligent Transportation Systems (ITS), Vehicular Ad hoc Networks (VANETs) have become a research hotspot in recent years. However, the vehicle communication system is vulnerable, resulting in threats to the privacy of users. This paper proposes a secure and efficient identity-based anonymous authentication scheme and uses pseudonyms to enhance the privacy protection of vehicle users. By improving the existing vehicle public key infrastructure and introducing Bloom filter to compress the Certificate Revocation List (CRL), the efficient pseudonym revocation scheme is then presented under the premise of ensuring user privacy. This scheme is able to perform batch pseudonym revocation and keep the pseudonym unlinkable. The security analysis shows that the proposed scheme is able to meet the security and privacy requirements in VANETs and CRL distribution.