Abstract：In order to realize the security authentication of the information transmission between vehicle nodes in vehicular Ad hoc networks, a certificateless aggregate signature scheme is designed. The proposed scheme uses certificateless cryptography, which eliminates the complex maintenance cost of certificate and solves the problem of key escrow. Communicating through pseudonyms and nodes around the roadside units generated, the conditional privacy protection is achieved for vehicle users. In the random oracle model, the scheme is proved to be existentially unforgeable against adaptive chosen message attack. Then, the efficiency of the scheme is analyzed, and the relationship between the traffic density in Vehicular Ad hoc NETwork (VANETs) environment and the time delay of message verification is simulated. The results show that the scheme satisfies the message authentication, anonymity, unforgeability and traceability, as well as the higher communication efficiency and the shorter delay of message verification, which is more suitable for dynamic vehicular Ad hoc network environment.
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