LB-CLBS: Lattice-based certificateless blind signature scheme for vehicle sensing within intelligent transportation

In intelligent transportation, sensors installed on vehicles provide various intelligence services to relevant management departments by collecting road information and other sensing data. Government administrations use these data to provide convenient services to vehicle users and promote intelligent transportation development. However, as the importance of data continues to grow, the threats to the privacy of sensing data have increased dramatically. Malicious attackers can illegally obtain sensitive information about a vehicle, including speed, location, behavioral preferences and other data. Furthermore, the rise of quantum computing continues to pose a challenge to vehicle privacy data. Therefore, in this paper, we propose a new lattice-based certificateless blind signature (LB-CLBS) scheme using the module lattice to enhance vehicle privacy protection in intelligent transportation environments. Concretely, we use certificateless cryptography to construct a blind signature scheme based on the basic framework of Dilithium, which both ensures that the scheme is post-quantum and solves the key escrow problem in traditional cryptosystems. Based on the module version of Small Integer Solution (MSIS) and module version of Learning With Error (MLWE) hard problems, we prove that the LB-CLBS scheme is existential unforgeability under adaptively chosen message attacks (EUF-CMA) in the random oracle model. The performance evaluation shows that our scheme has an advantage over the previous scheme in every security performance. In addition, the computational efficiency of our scheme is improved by at least 70% compared with the previous schemes.