Research On Trust Evaluation And Security Management Of Internet Of Vehicles Based On Blockchain

As an important foundation of the intelligent transportation system,the Internet of Vehicles realized the collection and distribution of information by establishing a network between vehicles and infrastructures.However,due to the characteristics of wireless communication and the Internet of Vehicles,it faces some security threats,such as message reliability and privacy leakage.If protection and management are not carried out,serious consequences will be brought.Therefore,it is of great significance to study the security mechanism of the Internet of Vehicles.In recent years,blockchain has been widely used in smart contracts,smart transportation,supply chain,data management,trust evaluation and other fields.Its rapid development has provided a new direction for the research of Internet of Vehicles security.Based on the existing research results,this thesis has formed the trust evaluation mechanism and security management model for the Internet of Vehicles nodes based on blockchain technology.The specific research work is as follows.Firstly,the common centralized Internet of Vehicles security management model is studied,the existing problems are analyzed,and the blockchain technology is combined to form a blockchain-based Internet of Vehicles security management model.The model is composed of vehicle nodes,RSU and its servers,and blockchain network.It mainly includes three parts: the message authentication mechanism,the trust evaluation mechanism,and the trust management mechanism.And explained the process of completed the above work.Secondly,the trust evaluation mechanism of vehicle nodes based on blockchain is explained.Compared common trust evaluation schemes and studied trust evaluation strategies.Combined with the characteristics of the Internet of Vehicles,the dynamic trust evaluation mechanism is formed based on the comprehensive trust value,and subsequent instant messaging to obtain the message trust value as the influence factor.A consensus mechanism based on trust proof is proposed to store and maintain the trust value of vehicle nodes.It improves the efficiency of trust evaluation of vehicle nodes,meets the requirements of dynamic evaluation,and solves the problem of untrustworthy messages of nodes with trusted behavior.Finally,the problem of privacy leakage caused by the trust value of tracking nodes in the trust evaluation process is solved.The node trust evaluation and security management mechanism in the environment of the Internet of Vehicles is studied,and the contradiction between the node trust evaluation and the need for privacy protection is analyzed.According to the trust value of the vehicle node,the corresponding level is divided,and the corresponding trust certificate is generated,forming a trust management mechanism to protect the privacy of the vehicle network node.Simulation experiments showed that the model improved the efficiency of trust evaluation to a certain extent,and identified malicious nodes quickly.And the recognition accuracy of malicious nodes is better,the security level of vehicle communication is improved,and the privacy and security issues of nodes in the process of trust evaluation and security management are solved.At the same time,it avoided the tracking of malicious nodes and effectively prevented nodes from denying and tampering with trust.The research results of this thesis are of great significance to the advancement of the research and application of the Internet of Vehicles security technology.