Recently, Lu et al. proposed an efficient conditional privacy preservation protocol, named ECPP, based on group signature scheme for secure vehicular communications. However, ECPP does not provide unlinkability and traceability when multiple roadside units (RSUs) are compromised In this paper, the authors make up for the limitations and propose a robust conditional privacy-preserving authentication protocol without loss of efficiency as compared with ECPP. Furthermore, in their protocol, RSUs can issue multiple anonymous certificates to an on-board unit (OBU) to alleviate system overheads for validity check of RSUs. In order to achieve these goals, the authors consider a universal re-encryption scheme as their building block. In Section 2, they describe their design objectives and define conditional privacy level for secure vehicular ad-hoc networks (VANET). They outline their system architecture in Section 3. Section 4 presents the proposed conditional privacy-preserving authentication protocol. In Section 5, the security and efficiency of the proposed protocol are analyzed. Finally, the authors conclude the paper in Section 6.


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