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In this paper the authors consider the problem of privacy and security in vehicular (V2V) communication, in particular securing routine safety messages. Traditional public key mechanisms are not appropriate for such applications because of the large number of safety messages that have to be transmitted by each vehicle, typically one message every 100−300ms. The authors' first show that a recently proposed V2V communication scheme, TSVC, based on the Time Efficient Stream Loss-tolerant Authentication (TESLA) scheme is subject to an impersonation attack in which the adversary can distribute misleading safety information to vehicles, and propose a modification that secures it against such attacks.
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