Efficient ECC-based conditional privacy-preserving aggregation signature scheme in V2V

Vehicular ad-hoc network system provides network communication technology and plays an important role in road safety and traffic control. Conditional privacy-preserving can safeguard privacy as well as trace malicious vehicles, which is critical in the system. However, in the restricted computing and communication resource situation, how to ensure the conditional privacy security remains a challenge. To address this issue, this research work proposes an efficient conditional privacy-preserving scheme. In this scheme, firstly, a certificateless aggregation signature has been performed on board to avoid channel conflicts, and to our best knowledge, this scheme is the first one to propose aggregation on board. Also an elliptic curve point multiplicative operation has been utilized to decrease the cost consumed in computation. Secondly, this article gives the security proof of the proposed scheme against the existence of unforgeability under adaptively chosen message attack for Type-I and Type-II adversaries in the random oracle model. Lastly, comprehensive performance comparisons covering the computation, communication and storage costs have been done to state that the proposed scheme is more efficient than the existing solutions. Significantly, this scheme saves at least 86% in communication overhead than compared schemes.