Research On Security Technology Of Data Sharing In Internet Of Vehicles Based On Blockchain

With the rapid development of the Internet of Things and the continuous progress of5 G technology,intelligent transportation has become the development trend of transportation technology.As an information exchange network,Io V(The Internet of Vehicles)can share traffic information between vehicles,bringing convenience to car owners and improving traffic efficiency.However,there are still many problems when sharing traffic data,such as privacy leakage,false information and low efficiency of information synchronization updating.Most of the existing schemes are based on centralized architectures,not only involving complex algorithms,but also sacrificing communication overhead to ensure security,resulting in high delay,high system overhead and single structural framework.In view of above problems,this paper proposes the architecture of Io V based on the consortium blockchain.For the problems of privacy security,consensus efficiency and other areas,three aspects of research are carried out:(1)To solve the problems of location privacy security and false information in transportation,this paper proposes a privacy protection protocol based on SM2 and trust management.This protocol introduces trust value;on the one hand,different from the existing schemes,it can ensure the security of pseudonym and resist attacks such as witch attack and conspiracy by using trust value as a part of pseudonym.On the other hand,the system can judge the reliability of information according to the trust value.At the same time,when designing the protocol,this paper uses SM2 elliptic encryption curve to change the communication format to reduce the computational complexity and communication overhead.Finally,the experiment proves that the protocol meets the requirements of our scenario.(2)To solve the problem of system cost caused by condition judgments in the updating of pseudonym,this paper proposes a new pseudonym replacement scheme based on vehicle trust.Different from the existing schemes,the formula of vehicle privacy exposure is designed to judge whether a pseudonym needs to be changed according to the real situation of each vehicle,rather than considering the integrity of the vehicles and ignoring the actual situation of the individual.At the same time,this paper proposes the pseudonym replacement protocol to ensure the security of replacement.The experimental results show that the scheme has a good performance in improving the utilization rate of pseudonyms and system security.(3)To solve the problem of efficiency in consensus for information updating,this paper proposes a RSU hierarchical consensus optimization of blockchain based on trust value.In order to meet the requirements of fast-moving speed of vehicles,the system need update and synchronize for information rapidly.As a result,this paper optimizes consensus structure into a bottom-up double-layer consensus structure to meet above requirements.Through experimental comparison,under the premise of ensuring safety,the optimized structure has good performance in reducing communication complexity,delay.