Vehicular Ad hoc Networks (VANETs) are on the verge of deployment. In the near future, wireless vehicle-to-vehicle and vehicle-to-infrastructure communication will enable numerous safety, convenience, and business applications. Security is a necessary pre-requisite for adoption of these technologies. As we demonstrate in this paper, VANETs require two new security properties: Convoy Member Authentication (CMA) and Vehicle Sequence Authentication (VSA). These security properties detect a range of VANET attacks. We propose novel protocols that provide CMA and VSA. We analyze and evaluate our protocols and conclude that they represent an important step towards enhancing VANET security.
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