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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.