||Vehicular ad-hoc networks(VANETs) is a popular topic received attention of academia in recent years. By broadcasting messages among vehicles can pass the information about the traffic and road conditions, and the vehicles can change the route to avoid traffic accidents or traffic congestion. To avoid attacker distributing malicious nodes do steal, tamper, interrupt, forge or spread false message when the vehicle broadcast a message, the RSU (Road Side Unit) is deployed to help the vehicles to make message authentication , to ensure message integrity and to make sure the message is send by the legitimate vehicle, rather than forged by a malicious attack.|
But RSU can be covered by the limited scope, and the high cost of hanging on street lamps or traffic lights, that the facilities can provide the power and network. In addition to the message authentication, how the vehicle be anonymous or private communication inter vehicles are VANETs’s important issues. In this thesis, we apply RSP (Random Secret Pre-distribution) in VANETs, to reach the message authentication, Anonymousness and Private communication in the environment without RSU.