A Privacy-Preserving Mutual Authentication Protocol for Vehicle Ad Hoc Networks

Recently, Jung et al. proposed a robust conditional privacy-preserving authentication protocol in vehicle ad-hoc networks. However, Jung et al.’s authentication protocol cannot provide unlinkage and mutual authentication during the communications between the vehicles and the road-side infrastructure units. In this paper, we propose an improved privacy-preserving mutual authentication protocol for vehicle ad hoc networks by using secure identity-based group blind signature, the private encryption system and the public encryption system. The proposed privacy-preserving mutual authentication protocol for vehicle ad-hoc networks satisfies mutual authentication, anonymity and unlinkability under Random Oracle Model and the Decisional Bilinear Diffie–Hellman (DBDH) assumption. In addition, the trusted center can trace malicious on-board units or road-Side infrastructure units in our protocol.