Research On Data Sharing And Trust Evaluation Method For Internet Of Vehicles

Internet-of-Vehicles(Io V)improves traffic efficiency by enabling vehicles on the move to share road traffic information through vehicle-road collaboration.However,due to the high speed mobility of vehicles and the complexity of the Io V environment,vehicles are vulnerable to various internal and external attacks in the process of data sharing,so the security problems faced by the data sharing of the Io V cannot be ignored.This paper proposes the following solutions for the five requirements on availability,integrity,non-repudiation,authenticity and privacy of data security sharing in the Io V.Firstly,in chapter 3,a vehicle trust evaluation method based on DAG(Directed Acyclic graph)distributed ledger is proposed to meet the requirements of availability,integrity and nonrepudiation of data sharing in the Io V.The method based on distributed books based on DAG to realize the secure storage of the Shared data and trust evaluation data,guarantees the nonrepudiation of data sharing,and then using dynamic workload proof mechanism based on trust,based on the vehicle’s trust evaluation implementation of rewards and punishments for different data sharing behavior,prevent the occurrence of the lazy and malicious attacks,This ensures the availability and integrity of data sharing in the Io V.Secondly,in chapter 4,a message reliability calculation method based on Bayesian network and evidence theory is proposed to solve the problem of message authenticity in data sharing of Io V.This method firstly calculates the confidence value of the message by synthesizing various confidence factors,and converts the confidence value of the message into the triplet of the trust evaluation of the message according to the membership function.Finally,the d-S evidence theory is used to fuse multiple evidences to get the judgment result.Experiments show that this method can deal with common false message attacks,and provides an efficient and lightweight judgment method to solve the authenticity problem of Io V messages.Finally,in chapter 5,this paper proposes a conditional privacy protection model based on zero-knowledge proof to solve the privacy problems of data sharing in the Io V and vehicle authenticity under privacy protection.Privacy protection in order to achieve the conditions,the model weighed vehicles identity traceability and the relationship between identity privacy,using zero knowledge proof of vehicle nodes anonymous authentication,at the same time,by setting the key audit,to ensure the vehicle identity traceability,meet the safety car data in netwqqqorked sharing claim to privacy and the truthfulness of the vehicle.Experimental analysis shows that this scheme can meet the requirement of conditional privacy and resist common witch attacks.