Analysis of Attacks and Challenges in VANET

Vehicular Ad hoc Networks (VANET) is a subgroup of (Mobile Ad Hoc Networks) MANET which is using for improves traffic safety system. Since the movements of Vehicles are restricted by roads, traffic regulations we can deploy fixed infrastructure at critical locations. We focus our study on the different kind of attacks and its behaviour or impact in safety system and how many challenges; we have to accept for high security. In this paper we classify different attacks based on different layers like MAC layer, network, transport, application and multi layer and different challenges which included authentication, availability Privacy, anonymity etc. After surveying we found that attacks in multilayer like denial of services (DOS) and DDOS are very harmful for security system as well as authentication and Privacy are big challenges. Simulation can be performed either on NS2 which is specially designed for network simulation or CAN network at VANET tool box in MATLAB. Keywords— VANET, DOS, DDOS, MAC, CAN.