Prevention of Sybil attack and priority batch verification in VANETs

VANET is a form of Mobile Ad-Hoc Network which provides communication between vehicles and road-side base stations. The aim is to provide safety, traffic management, and infotainment services. The security of VANET is in concern state from early time. VANETs face several security threats and there are a number of attacks that can lead to human life loss. Existing VANET systems used detection algorithm to detect the attacks at the verification time in which delay overhead occurred. Batch authenticated and key agreement (ABAKA) scheme is used to authenticate multiple requests sent from different vehicles. Yet it does not provide any priority to the requests from emergency vehicles and a malicious vehicle can send a false message by spoofing the identity of valid vehicles to other vehicles leading to Sybil attack. Priority Batch Verification Algorithm (PBVA) is used to classify the requests obtained from multiple vehicles in order to provide immediate response to emergency vehicles with less time delay. This system also to prevent Sybil attack by restricting timestamps provided by RSU at an early stage itself.