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Vehicular Ad-hoc NETworks (VANETs) are being advocated as a means to increase road safety and driving comfort, as well as to facilitate traffic control and management of parking lots and public areas. When designing a cooperation-based system, it is important to address security and privacy concerns. The system needs to be robust to non-cooperating entities and should ideally be able to detect/punish them quickly. Unfortunately, in VANETs, most privacy-preserving schemes are vulnerable to Sybil attacks, whereby a malicious user can pretend to be multiple vehicles. To eliminate this proposed, a lightweight and scalable protocol to detect Sybil attacks.
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