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ABSRACT Vehicular ad hoc network (VANET) is an important component of Intelligent Transportation Systems. In VANET, active safety systems is seems as the main benefit of it, in which vehicles are exchanging safety messages to increase the passenger safety on road. At the present time, vehicles are exposed to many security threats; and for the security, availability of network is must be obtained at every time. The availability of the network is extremely needed when a vehicle sends any safety information to other one. In this regard, DoS attacks are very dangerous in VANET because they adversely affect the network availability. One of them is oppress the node resources by flooding of messages to the victim vehicle; which is a common form of Denial of Service (DoS) attacks, in which a malicious node sends a large number of (False) safety message to the victim node. In this paper, an efficient method is proposed to defend against DoS attacks. According to our method each vehicle in a network has limited capacity of massage (safety message) receiving, without having any security risk and this limited capacity is defined by our (QLA) algorithm. This is a very simple method and can be easily deploy in network. Simulation results show that the approach is very effective and efficient against denial of service attack in VANET.

Queue Limiting Algorithm (QLA) for Protecting VANET from Denial of Service (DoS) Attack