Given the popularity of vehicular Ad hoc networks (VANETs) in traffic management, a new challenging issue comes into traffic\nsafety, that is, security of the networks, especially when the adversary breaks defence. Sybil attack, for example, is a potential security\nthreat through forging several identities to carry out attacks in VANETs. At this point, the paper proposed a solution named\nDMON that is a Sybil attack detection method with obfuscated neighbor relationship of Road Side Units (RSUs). DMON presents\na ring signature based identification scheme and replaces vehicles� identities with their trajectory for the purpose of anonymity.\nFurthermore, the neighbor relationship of RSUs is obfuscated to achieve privacy preserving of locations.The proposed scheme has\nbeen formally proved in the views of security and performance. Simulation has also been implemented to validate the scheme, in\nwhich the findings reveal the lower computational overhead and higher detection rate comparing with other related solutions.
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