Abstract: By using certificateless public key cryptosystem, we constructed a new aggregated signature algorithm to achieve the authentication of information transmission between vehicle nodes in vehicular sensor network. The new scheme achieved the conditional privacy protection for vehicle users through shadow value and nodes around the roadside units generated. The experimental results show that the scheme not only eliminates the complexity of certificate maintenance costs, but also solves the key escrow problem, and meets the authentication, anonymity, unforgeability and traceability of message, as well as the communication efficiency is higher, and the message verification delay is shorter.

Key words: certificateless cryptosystem, aggregate signature, vehicular sensor network, security authentication