Research On Trusted Multicast Routing Protocol In Vehicle Ad Hoc Network

The large-scale application of the Vehicular Ad hoc Network(VANET)makes communication between vehicles more convenient.Due to the self-organizing nature of the vehiclar ad hoc network,the vehicles in the network can freely travel without any constraints,and messages can be delivered from source vehicles to destination vehicles through multiple intermediate vehicles.The premise of messaging is the support of routing protocols.However,the existing protocols mainly focus on the efficiency of the protocol itself,ignoring the influence of external factors on the protocol.In fact,vehicular ad hoc networks are vulnerable to various malicious attacks from internal vehicles.In order to make the routing protocol resist malicious attacks in the network and ensure the reliable transmission of messages between vehicles,the multicast routing algorithm in the vehicle ad hoc network is studied in this paper,which is mainly divided into the following aspects:(1)This paper summarizes and analyzes the performance of several multicast routing protocols which are of different types and are very representative.Then the malicious attack is added to study the anti-attack of these protocols by comparing the performance of these protocols.Finally,through the anti-analysis of these protocols,lay the foundation for the design of reliable multicast routing in the future.(2)By combining the gray model,exponential smoothing method and golden section search method,a trust prediction model based on grey exponential smoothing model is proposed.The model effectively improves the prediction accuracy of non-smooth data by smoothing the initial prediction sequence.Finally,a new multicast routing protocol is proposed based on the prediction model,called ESGM-ODMRP,which can can more accurately calculate the trust value of each vehicle and identify malicious vehicles.(3)A new direct trust and recommendation trust calculation method is proposed,which can effectively deal with gray hole attacks,bad-mouthing attacks and on-off attacks of malicious vehicles.Combining the trust model with the routing protocol,a trusted secure multicast routing protocol against multiple attacks is proposed.And the new protocol improves the traditional route establishment process,further reducing the routing overhead and improving the overall efficiency of the protocol.