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Ad-Hoc Networks (VANET) are a specific type of wireless ad-hoc networks, formed with short range wireless communication devices, each one representing a vehicle on the road or a static device. Developing applications and protocols for Vehicular Ad-Hoc Networks (VANETs) poses unique security challenges, induced by the devices being used, the high speed and sporadic connectivity of the vehicles, the high relevance of their geographic location combined with the absence of adequate/reliable means of determining it. Since the last few years VANET have received increased attention as the potential technology to enhance active and preventive safety on the road, as well as travel comfort. Security and privacy are indispensable in vehicular communications for successful acceptance and deployment of such a technology. Generally, attacks cause anomalies to the network functionality. A secure VANET system, while exchanging information should protect the system against unauthorized message injection, message alteration, eavesdropping. This paper is an attempt to highlights the problems occurred in Vehicle Ad hoc Networks and security issues.

An Essential of Security in Vehicular Ad hoc Network