Research On Security Authentication And Privacy Preserving Technology In VANET

With the rapid development and wide application of 5G,cloud computing,sensor devices,vehicle networking has gradually become the research focus of scholars in various fields as a wireless network communication system with wide application prospects.As the basis of self-driving,vehicular ad-hoc networking(VANET)has gradually become a research hotspot.In the VANET,vehicles can communicate with other vehicles or roadside infrastructure using their on-board unit and exchange security traffic information in time to improve user’s driving safety and driving experience.However,since the VANET is an open wireless communication network,which makes it easy for malicious users to attack the transmitted message.Besides,if the vehicle directly uses the real identity to communicate,it will inevitably lead to the disclosure of the identity privacy of the vehicle.At the same time,attackers can use the captured identity and location data to mine private information such as user behavior trajectories,which brings great security risks to users.Therefore,the research about the privacy preserving of VANET has great significance for the application of autonomous driving technology in the future.In order to solve the problems existing in VANET,the main work of this dissertation is as follows:(1)An efficient information sharing scheme for conditional privacy protection and collision warning is proposed.In this scheme,when the vehicle exceeds the limited speed in the area,the vehicle’s speed sensor will automatically generate the overspeed information,and then the on-board unit will sign the overspeed information and send it to the surrounding fog node.After receiving the signed message,the fog node should authenticate the message firstly.If the message authentication is passed,it shows that the message is a valid speeding information,then the fog node immediately re-signs the information and broadcast it to the nearby vehicles.Other vehicles can respond in time after receiving the message to avoid collision with the overspeed vehicle.In the process of communication,the vehicle always uses pseudo-identity for signature and authentication to protect the vehicle’s identity privacy.(2)A privacy protection relay node selection scheme in cooperative communication is proposed,which uses the communication between vehicles to achieve the cooperative download function of large files.When the target vehicle is unable to complete a download task alone,the vehicle can send a request for cooperation information to the surrounding vehicles.After receiving the message,the surrounding vehicles choose whether to cooperate or not by their own conditions.The vehicles who are willing to participate in the task should return the participation information to the target vehicle.Then,the target vehicle selects the vehicle with high reputation value based on the received participate information,and sends the selected message to the RSU.The RSU divides large file into several small files and sends them to cooperative vehicles.After the cooperative vehicle has finished downloading,the file will be forwarded to the target vehicle to end this task.For vehicles who have completed the task,RSU can increasing its virtual reputation value as a reward.Besides,the vehicle always keeps anonymous in the process of communication to protect the vehicle’s identity privacy.(3)The message loss rate and the average transmission delay of different schemes in the communication process are compared by the simulation experiment,and the computational overhead and communication overhead of the scheme are also compared.From the experimental results,it can be seen that the proposed scheme can be used in the practical application scenario of the VANET,and has a better performance in terms of communication efficiency.