Antisybil: Standing against sybil attacks in privacy-preserved VANET

In this paper, we aim at two conflicting goals, privacy and Sybil ��attacks in Vehicular Ad Hoc NETworks (VANETs). Sybil attack ��refers to impersonation of one physical entity for many, namely ��Sybil nodes. Such attacks may cause dire consequences such as ��traffic jams or even deadly accidents. We leverage pseudonymless ��beaconing in order to ��preserve privacy. To cope with the Sybil ��attack, we put forth a twofold strategy. For scheduled beacons, ��we ��employ TRM (Tamper Resistant Module) to perform a ��lightweight pre-assembly data analysis on beacons whereas ��for ��ERMs (Event Reporting Messages), RSUs distribute ��authorized tokens among benign vehicular ��nodes which in turn ��are consumed to report ERM. Our proposed scheme preserves ��privacy ��in both beacons and ERMs, and offers conditional ��anonymity.�� �� 2012 IEEE