Abstract
Certificate-based Cryptography (CBC) combines the advantages of ID-based cryptography (implicit certification) and traditional PKI approach (no key escrow). Based on CBC, an anonymous authentication protocol featured with conditional privacy preservation and non-repudiation is proposed for vehicular ad-hoc network. First, a certificate-based signature scheme with only one pairing computation and only one element signature is proposed. Then, an anonymous authentication protocol is constructed by applying the proposed signature scheme and a novel concept called the account index which helps to realize On-Board Units anonymity, non-reputation, and conditional privacy preservation. A secure session key is established in the protocol which provides perfect forward secrecy.
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