Research On Vehicle Network Routing Algorithm Based On Security Trust Model

VANET is a special mobile(MANET)network.It is a self-organizing network among vehicles and roadside units.It consists of vehicle nodes and roadside units,including V2V and V2I Communication mode.Vehicle networking is an important part of smart cities.But,the highly dynamic and wireless scalability of the vehicle network topology makes the vehicle network have security risks in terms of security and reliability.The transmitted message could be tampered by the dishonest node on the road,What is worse is that the delay of message forwarding could also be increased or the message even could be discarded.Currently,there is no perfect security protection system to ensure the reliable security performance of the vehicle network.Therefore,it is very important to find and maintain a reliable and secure routing path,which leads to security.Routing algorithms have become a hot and difficult problem in the current research of vehicle ad hoc network.This thesis is mainly aimed at the security challenge of vehicle network rout-ing security.A clustering mechanism based on vehicle node mobility clustering is proposed,and a security trust model based on information credibility and node reputation value in vehicle network is constructed.The trust model is based on the information attributes,the security performance of routing algorithms CBR and AODV is improved.Based on the trust model,the secure trust routing algorithm TSRP is designed.Finally,the trust model and the improved design algorithm are tested and analyzed through simulation experiments.The experimental results show that the trust model based on the clustering mechanism can reduce the transmission delay to a certain extent,and the improved algorithm has a certain improvement in the delivery rate.In the analysis of the security risks in the interaction between nodes(vehicles and RSUs)in the vehicle network,a clustering mechanism based on vehicle mobility characteristics is proposed for the characteristics of urban traffic.The designation is based on the clustering mechanism.Then the information credibility is calculated depend on the node who is aroungd the accident.The fuzzy logic is used to judge the correctness of event information.The method of node reputation value update is proposed,and the trust model CSTM is constructed.This model can eliminate the dishonest node from the vehicle network and ensure the safety and reliability of the vehicle network.Experiments show that the trust model CSTM can reduce the average transmission delay to a certain extent in the case of consistent speed and vehicle density,but there is still room for improvement in authenticity detection rate and trusted data packets.After analyzing the performance difference of the routing algorithm in the ve-hicle network,the CBR and AODV algorithms are optimized and improved for the hidden dangers of the routing algorithm in security trust.The optimized algorithm has certain improvement in terms of end-to-end delay and delivery rate.But there is still a problem of low delivery rate.In response to this problem,the secure routing algorithm TSRP is proposed based on the trust model CSTM.Experiments show that the proposed algorithm has a certain improvement in delivery rate.Since the field deployment of the Internet of Vehicles experiment is too costly and difficult to implement,the vehicle networking experiment is carried out through the vehicle network simulation platform.The experimental process in this paper is based on the vehicle network simulation platform composed of OMNET++,SUMO and Veins.Through experiments,it can be concluded that the security trust at-tribute of the node on the road can guide the routing algorithm design,and can improve the performance of the routing algorithm in terms of average delay and delivery rate.