Research On VANET Authentication Protocol Based On Trusted Pseudonym Exchange

Vehicular Ad hoc Network(VANET) is an extension of the Internet of things in Intelligent Transportation, which has great application value in the field of safety and driving assistance. However, due to the personal attributes and social attributes of vehicles, the attacks in VANET often contain huge commercial value, attacker could sabotage or grab illegal profits through masquerade, wiretapping, or release fake message. Therefore, the solution of security authentication and privacy protection is the precondition of VANET application.VANET contains a large number of nodes, and the distribution of concentration. A large number of nodes at the same time send message to the surrounding, is easy to cause the congestion of wireless network. In addition, the node in VANET are deployed in the open environment, the risks facing the attack is complicated. Traditional mobile self-organized network security research cannot be directly applied to the VANET environments.The main work of this paper is researching on the protocol of identity authentication and privacy protection, studying the knowledge of anonymous authentication in the depth, and using this as the support of the hybrid authentication protocol based on trusted pseudonym exchange. Through theoretical analysis and simulation experiments prove that the proposed protocol is practical and feasible in VANET.The main works are as follow:(1) In-depth study of the structural characteristics and security needs of VANET; In-depth study the present anonymous authentication technology of information security and privacy protection; the implementation principle of the authentication protocol based on pseudonym and group signature is summarized. Summary and analysis the advantage and the shortage of the research.(2)Based on the research of pseudonym and group signature protocol, combining with the advantages of two kinds of research direction and proposed a mixed authentication based on the pseudonym exchange. Through the analysis of the algorithm of key transport in the open network. Firstly, a pseudonym exchange protocol is proposed, which is suitable for the VANET environment, and can resist the replay attack, the man-in-the-middle attacks and collusion attack, by using the pseudonym exchange of anonymous certificate and identity information to achieve privacy protection of the protocol. Secondly, we puts forward the introduction of group signature as identity tags for the non-repudiation and auditable. At last, a white list of alias is proposed, which can solve the replay attack caused by alias exchange very well.(3) First use of the MOVE and the SUMO in the process of simulation to simulate the real environment of road and traffic node, then output the results and imported into the NS2 network simulation, at last, by programming the experiment network data for two indicators packet loss rate and the end-to-end delay. It is found that the packet loss rate and the end to end delay are increased by 0.12% and 0.18% respectively compared with the centralized group signature scheme.Research findings by this paper can greatly enhance the verification efficiency of message. Implementation of privacy protection while achieving efficient security authentication, so it has a certain value of applied and research.