Abstract: Vehicular Adhoc NETworks (VANETs) have the high potential in commercial value and application prospect. For VANET have some specific security requirements so the routing protocols and security schemes in ad hoc networks not adapt to VANETs. As the vehicle move very quickly, hence it’s necessary to a new security scheme for VANETs. In this paper we discuss the necessary requirements for security and safety in VANETs. We give detail taxonomy of security in VANET. Also describe the privacy and authenticity issue of vehicle to vehicle and vehicle to infrastructure and defined the problems of protecting privacy in VANET.