Research On Safe And Efficient Message Authentication Method In Vehicle Ad Hoc Network Environment

With the continuous deployment and application of 5G technology,VANET is facing unprecedented development opportunities.However,due to the strong dynamics of nodes in the vehicle network and rapid changes in the network topology,a series of problems such as slow authentication rate of vehicle nodes and high message packet loss rate are caused.On the other hand,some malicious vehicles use the interconnectivity of nodes to initiate malicious attacks such as tampering,impersonation,and replay,which cause great hidden dangers to traffic conditions and vehicle safety.Not only that,attackers can use the vehicle network to illegally obtain user privacy information such as driving trajectory,vehicle owner information,etc,which can easily lead to the disclosure of the driver’s privacy.Therefore,it has important practical significance to provide a safe and efficient message authentication method for the vehicle network.In view of the above problems,the main research contents of this thesis are as follows:Aiming at the problems of slow calculation rate,leakage of user privacy and vulnerability to illegal attacks in vehicle network message authentication,an identity-based message authentication method is proposed.This method uses elliptic curve cryptography to protect the integrity of the message,while using anonymous authentication to protect user privacy,and batch message authentication to ensure the authentication speed.On the one hand,it ensures the safe transmission of vehicle network information,and on the other hand,it satisfies the needs of vehicle nodes and roads.The need for message authentication between edge unit nodes.Through security and simulation analysis,it is verified that the proposed method not only improves the message authentication rate,but also reduces the computational and communication overhead in the process of message signature generation and authentication while realizing the communication security and privacy protection of the in-vehicle network.However,when the number of messages in the traffic environment increases sharply,there is no guarantee that the RSU will authenticate the signature of each vehicle,resulting in a certain message delay.Therefore,based on this method,another method is proposed to improve the message delay problem.In order to solve the problem of delay in the message authentication process,a message authentication method based on agent vehicles is proposed according to the characteristics of the vehicle network.The RSU first finds vehicles with additional resources to become agent vehicles,then hires these agent vehicles to verify the messages of other vehicles,and then transmits the verification results to nearby RSUs.RSU only needs to verify the output results of the agent vehicles,and does not need to The message of the car is authenticated,so as to reduce the message delay and reduce the message packet loss rate.At the same time,under the elliptic curve discrete logarithm problem,the unforgeability of the underlying signature to the adaptive selection message is verified to ensure that it meets the security goal of message authentication,and it is proved through reasoning and analysis that this method can increase the authentication rate and reduce the authentication overhead of RSU.Theoretical analysis and simulation results show that the authentication method proposed in this thesis can increase the rate of message authentication,reduce the authentication delay,reduce the computational and communication overhead in the authentication process,and meet the security requirements of the vehicle network and achieve the expected goals.