Anonymous credentials for the internet of vehicles

With the development of the Internet of Vehicles (IoV), a large number of vehicle-related service providers have emerged. To solve the problem of malicious service providers excessively collecting and leaking user privacy, we propose an anonymous credentials scheme based on Coconut signature for the IoV. This scheme uses the techniques of blind signatures, zero-knowledge proof, and secret sharing, which can make vehicle users selectively display credential attributes according to the service scenario. The anonymous credentials assure that users are authorized for services without exposing excessive information and maintaining unlinkability across multiple disclosures. Moreover, our proposed scheme can effectively resist collusion attacks from up to t-1 authorities and prevent malicious service providers from correlating vehicle user information, tracking user identities, and analyzing user behavior. The analysis results show that our proposed scheme has a better performance and meets various security requirements such as anonymity, unlinkability and unforgeability compared with other baseline schemes.