Efficient and Feasible Methods to Detect Sybil Attack in VANET

Large scale node to node systems face security threats from malfunction or hostile remote computing elements. Node to node system commonly relies on the existence of multiple independent remote entities to mitigate the threat of hostile nodes. Sometime single faulty node can produce various identities leading to control of substantial fraction of the system. These attacks are called Sybil attacks. Since few years, Vehicular Ad hoc Networks deserve much attention. VANET is a technology that uses moving cars as nodes in network to create a mobile network it turns every participating car into a wireless router or nodes, allowing cars approximately hundred to three hundred meters of each other to connect and in turn, create a network with a wide range. The development of wireless communication in VANET implies to take into account the need of security. In VANET, many attacks rely on having the attacker generate multiple identities to simulate multiple nodes. The recent gain of interest for wireless communication in Vehicular Ad hoc Network (VANET) implies an always increasing number of applications in this kind of network. All these applications need to exchange data with other vehicles. The communication security problem must be taken into account due to the critical goal of safety related applications such as emergency brake. Moreover, due to the limited communication range of a vehicle, the cooperation between nodes is essential. This necessity of cooperation shows the vulnerability of these networks and Mukul Saini et al 432 the need of fake nodes detection. In this paper we are checking Sybil attacks in VANET by power level of signal coming from same node.