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Vehicular ad-hoc networks (VANETs) are one of the most important componentsin Intelligent Transportation System (ITS), which aims to provide secure andefficient communication between vehicles. Safety-critical vehicularcommunication requires security, privacy, and auditability. To satisfy theserequirements simultaneously, several conditional privacy-preservingauthentication schemes are proposed by employing ring signatures. However,these methods have paid little attention to the issues like how to choose thevalid ring members or how to set up a ring. In this paper, we introduce anefficient conditional privacy-preserving scheme which provides an appropriateapproach establishing the list of ring members with efficient revocation.Moreover, our proposed scheme also provides batch verification to significantlyreduce the computational cost. According to the analysis of security, ourscheme is sufficiently resistant against several common attacks in VANETs. Theperformance results show that the proposed scheme is efficient and practicalwith both low computation and communication cost.

An Identity-based Batch Verification Scheme for VANETs Based on Ring Signature with Efficient Revocation