Comments on "Proving Reliability of Anonymous Information in VANETs" by Kounga

Three vehicle-to-vehicle communication schemes by Kounga (?Proving reliability of anonymous information in VANETs,? IEEE Trans. Veh. Technol., vol. 58, no. 6, pp. 2977-2989, Jul. 2009) were recently published to address the issues of certificate management, scalability, and privacy. We present a number of attacks on one of the schemes. Our result shows that, contrary to what is claimed, this scheme does not provide the following four security features: (1) authenticity of a message; (2) privacy of drivers and vehicles; (3) reliability of distributed information; and (4) revocation of illegitimate vehicles.