Research On Authentication And Key Agreement Scheme For VANETs

With the rapid development of the intelligent transportation system,vehicular ad hoc networks(VANETs)have attracted more and more attentions.The VANETs can provide a safer and more convenient driving environment,which also brings a lot of challenges.On one hand,because the channel used is public,the VANETs are vulnerable to the security threats such as counterfeit attacks,replay attacks and position tracking.Therefore,suitable security mechanisms should be designed to protect traffic safety and user privacy.On the other hand,due to fast movability of the vehicles,the performance requirements such as high efficiency and reliability should be satisfied.Although there have been a lot of security research schemes in VANETs,how to construct a safe and efficient scheme is still an important issue for VANETs security research.To achieve mutual authentication for vehicle to vehicle(V2V)communication and vehicle to public infrastructure(V2I)communication and to guarantee safety of the session,most authentication and key agreement schemes for VANETs have been proposed,including group signature based schemes,certificate based schemes,elliptic curve based schemes,etc.However,there are some disadvantages in these schemes,such as expensive costs,high computation overhead and weak security.The main work of this thesis is shown as follows:1.An authentication and key agreement scheme without trusted third party is proposed for the traditional V2 V communication environment.The proposed scheme enables the vehicle to authenticate and securely communicate with other vehicles in the absence of infrastructure such as the Road Side Unit(RSU).The security of this scheme has been proved under the random oracle model and the correctness of this scheme has been verified by BAN logic.In addition,since bilinear pairings is not used in the proposed scheme,the performance of this scheme is better than other schemes.The security of this scheme is based on the computational Diffie-Hellman problem.In consideration of security and performance,the proposed scheme is feasible and meaningful.2.Considering the problem of roaming authentication and key agreement for VANETs under the multiple service domain,and based on the above-mentioned two parties authentication schemes,a roaming authentication and key agreement scheme based on elliptic curve is further proposed.This scheme can not only provide secure communication and anonymous authentication between the external agent and the vehicle,but also can provide traceable services between local agent and the vehicle.Compared with other similar schemes,the proposed scheme has some advantages in performance as well as security.