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Vehicle-to-vehicle (V2V) and vehicle-to-roadside (V2R) communications have raised a series of challenges due to data security and user privacy. Vehicular ad hoc networks (VANETs) have become the target of malicious attacks. Authentication has been widely adopted in VANETs to guarantee secure communications. However, existing authentication schemes have failed to meet stringent time requirements of VANETs leading to information loss. In this paper, we propose an efficient anonymous batchdoi:10.1186/s13638-018-1294-z fatcat:43lvrbz4wjd4xpuivuui2rgn5i