Research On Safe And Efficient Authentication Scheme In VANET

Vehicular Ad hoc Network(VANET)is an important way to realize Intelligent Transportation Systems(ITS),this can not only facilitate the management and control of traffic,but also can enhance the driving safety and improve the driving experiences.In VANET,nodes can share information resources by transfer messages to each other.However,the network is vulnerable to security attacks and privacy attacks because of the fragile environment of the network.Message authentication is an important way to ensure the security of communication and it is widely used in VANETs.However,the nodes in VANETs have a stringent time requirements of messages because of the dynamic and the topology of the network.The existing authentication schemes oriented to VANETs have failed to meet stringent time requirements of the network leading to information loss.The information loss occurs often to nodes,especially in the heavy traffic.Therefore,it is necessary to study the safe and efficient message authentication scheme in VANET.Firstly,we introduce the present research state and future development tendency of the VANETs and authentication,and then we describe the necessity and innovation of our study.Then we analyze the security and privacy problems existing in VANETs and we propose an efficient digital signature and authentication algorithm to improve the rate of message authentication,reduce the computation cost and time cost in message authentication.The proposed algorithm is evaluated by extensive analysis,and the result demonstrates that the algorithm is efficient and it can guarantee the information security and the user's privacy.Secondly,in order to avoid the high message loss rate problem due to authentication delay,we propose an efficient and safe message authentication scheme based on the special characteristics of VANET.Vehicles and road side units are two most important communication nodes in VANET.In our scheme,we allow vehicles to classify their received messages into several priority queues and authenticate messages based on the classification result so that messages with high priority will be authenticated preferentially,so as to reduce the important message loss rate of vehicles.We introduce a cooperative authentication algorithm based on reverse auction for road side units,cooperative authentication can reduce the workload of the road side units and the auction mechanism can make road side units choose cooperative users fairly and pay for them reasonably.The proposed scheme is evaluated by extensive analysis and simulations,and the result demonstrates that the scheme can improve the authentication efficiency,reduce the message loss rate significantly,and guarantee the information security and privacy.