Research On Secure Authentication Mechanism For VANETs

With the rapid development of the Internet,vehicular ad hoc networks(VANETs)has become a research hotspot.VANETs can realize information exchange and integrated intelligent management between people,vehicles,roads and service platforms through new wireless communication technology.It not only can effectively reduce the occurrence of traffic accidents,improve traffic safety and efficiency,bring users more comfortable,efficient and intelligent driving environment and experience,but is also conducive to improving the intelligence level of social transportation.Although VANETs has bright application prospects,there are still some security and privacy issues.For example,the broadcast nature of wireless communication makes the transmitted information vulnerable to attacks such as eavesdropping attacks,forgery attacks,and impersonation attacks.In addition,the number of vehicles is very huge and the mobility is strong,which requires vehicles to be able to complete communication in a very short time.Once the information is delayed,it loses the meaning of information exchange and cannot provide correct information for vehicle decision-making.Only by solving the above problems,VANETs will be possible to mature and popularize in the future.Therefore,it is necessary to research the efficient and secure authentication mechanism for VANETs.This paper mainly conducts in-depth research on authentication mechanism for VANETs.The main work is as follows:(1)Aiming at the security defects in Cui et al.’s scheme,an improved mutual authentication scheme is proposed with forward security for VANETs.It not only supports message verification,but also supports identity authentication,and realizes batch verification at the same time,which greatly improves the verification efficiency.Furthermore,the proposed scheme is proved to be secure based on the elliptic curve discrete logarithm hard problem.Experimental analysis shows that the proposed scheme has better security performance and efficiency compared with other related schemes.(2)In order to solve the problem of key exposure,we construct an authenticated key agreement scheme with strong key exposure resistance.The vehicle periodically updates the private key with the assistance of the delegation server to ensure that the exposure of the private key in the current time period does not affect the security of the private key in any other time period.In addition,the vehicle only needs to register once,and can establish a session key with any edge node.The anonymity and unlinkability are realized at the same time in the proposed scheme.Finally,the proposed scheme is proved to be secure based on the computational Diffie-Hellman hard problem.Experimental analysis shows that the proposed scheme has obvious efficiency advantages compared with other related schemes.(3)For the authenticated key agreement scheme with strong key exposure resistance,a simulation experiment using Java programming language is carried out to verify the correctness and feasibility of this scheme.