Research On Trust Management Scheme Based On Blockchain In Internet Of Vehicles

With the rapid growth of the number of cars,the problems of road traffic safety and traffic congestion are becoming more and more serious.Vehicle networking is a new generation of intelligent transportation technology to realize the omni-directional connection and communication between vehicles and surrounding people,vehicles,transportation infrastructure and networks.It is considered to be the key to solve the above problems.Because the Internet of vehicles has the characteristics of frequent changes in network topology,diversified communication scenarios and large node density,the vehicle nodes in the Internet of vehicles face more and more complex network internal attacks than the traditional network nodes.Especially when malicious vehicles deliberately broadcast false information related to traffic safety,the driving decision of vehicles will be greatly affected.Such malicious behavior will pose a serious threat to the efficiency and safety of the traffic system.Trust management mechanism can effectively measure the credibility of vehicles in the Internet of vehicles,help vehicles avoid malicious vehicles and select trusted vehicles for cooperation.Aiming at the problem of trust management in the Internet of vehicles,this dissertation mainly does the following research:(1)In this dissertation,a trust model for evaluating vehicle reliability is proposed,which uses Bayesian trust inference and TrustRank algorithm to evaluate the local trust value and comprehensive trust value of vehicles respectively.When calculating the local trust value,the penalty factor and adjustment function are added on the basis of the current Bayesian trust theory to reduce the impact of switching attack on the evaluation results,and the time sliding window is introduced to update the local trust value;The trust link graph of all vehicles is constructed according to the local trust value.Finally,the trust relationship between vehicle input and output in the trust link graph is integrated,and the comprehensive trust value of vehicles is calculated by TrustRank algorithm.(2)This dissertation proposes a distributed trust management scheme for the Internet of vehicles based on blockchain technology,which realizes the storage and management of vehicle trust data by connecting RSU into a distributed blockchain network;Secondly,the POA consensus algorithm is improved to improve the efficiency of trust data update;This paper studies the blockchain technology and Ethereum platform,constructs a decentralized application framework based on Ethereum blockchain platform,and develops a decentralized Internet of vehicles trust management application on Ethereum platform according to the framework.Finally,the security performance of the application is analyzed and compared.Use OMNeT + + 5.5.1 and veins5 0 and SUMO1 2.0 joint simulation platform verifies the model proposed in this paper.The simulation results show that the local trust value calculation model with penalty factor and adjustment function is conducive to resisting switching attack;Compared with other related models,the true positive rate and true negative rate of the trust model proposed in this dissertation are significantly improved,which verifies the effectiveness of the model.Finally,the development and deployment of smart contract and the construction of Ethereum development environment are completed based on Ethereum platform.The trust management scheme proposed in this paper is realized by using truffle,Ganache and other tools and programming languages.The implementation process of the scheme is introduced in detail from the aspects of system framework,function design and design process,and the scheme is tested to verify the feasibility of the proposed scheme.