Research On Efficient And Secure Internet Of Vehicles System Based On Blockchain

With the development all kinds of smart sensing equipment,we enter the Internet of Things era,the data can be well documented by the sensors and other micro devices.Hence a number of related application appeared,especially in the Internet of Vehicle:the road condition prediction and path planning which facilitated people’s lives.This kind of applications always contain a large number of data collection requirements to guarantee the efficiency and accuracy of the service.So crowdsensing in the Internet of Vehicle rises in response to the proper time and condition,server can collect data from the users who equipped with sensors to save data acquisition overhead and provide the user with award to protect the right of users.However,these applications always adopt the centralized server which may lead to some security-related problems like singlepoint failure and make these applications unreliable.At the same time,during the crowdsensing task,the user may face the privacy leaking problem in the Internet of Vehicles which may reduce enthusiasm of users,how to protect the user privacy while commit the valid data will be a challenge.Blockchain is a point-to-point network,which uses techniques of cryptography like asymmetric encryption,hash function and so on to guarantee the immutability and all nodes have a copy of the ledger to protect the transparency,there are many successful applications that are seen as examples of distributed system.So,we will conduct our study based on blockchain.At first,a privacy-preserved data transaction protocol based on blockchain is proposed,this scheme adopts blind signature to design a set of data interaction processes,which includes four types of entity,the specific interaction process will be executed on the blockchain which can effectively solve the problems of centralized server.The protocol combine the authorized authority who produce the blind signature with road side unit who verify the identity of user and assign the user with new identity token to finish the process of binding information backflow.The authorized authority will be recognized as the starting point and road side unit will be recognized as the ending point of user temporary identity.So the real identity of the user will never be revealed by anyone,also the user has passed the admittance.The security analysis proves this protocol has a high level of security and privacy,the simulation shows that the cost of computational and storage resource are within reason and we have optimized the identity verification process to reduce the waste of resources.Compared with others,this protocol can effectively finish the data backflow and guarantee privacy preserving.Secondly,an incentive algorithm is proposed based on data transaction protocol,which improves the enthusiasm of user during the crowdsensing task.And structured the reputation model,to infer the contribution value by truth discovery to encourage the honest behavior,adopted the game theory to analysis the parameter setting to guide users take honest actions.To complete the transaction process,this algorithm designed the smart contract and described the specific algorithm,the smart contact includes the control of user identity like admittance,the on-chain task release and reputation binding.The simulation shows the smart contract can effectively achieve the system function and the cost is in reasonable range,the reputation algorithm can effectively recognize honest,dishonest and lazy behavior,also the parameter can be set to adapt to different needs.