A Survey on Security in VANET

Vehicular ad hoc networks (VANETs) are getting a lot of consideration these days due to the various applications and possible benefits they offer for their future users. Safety information exchange allows important applications, such as the alerting drivers during crossroads traversing and track merging, and thus, plays an important role in VANET applications. In a VANET, vehicles will depend on the reliability of received data for deciding when to present alerts to drivers. The communication between two vehicles, vehicle to roadside unit is done through wireless communication. That is why security is an important alarming area for vehicular network application. For authentication purpose large amount of bandwidth is consumed and the performance gets affected. In VANET there are some serious network attacks such as Sybil attack are possible. In this paper light is thrown on the previous researches done in this area and researches are compared.