Secure Communication For Internet Of Vehicles Based On Blockchain

Internet of Vehicle(IoV)is a typical application of Internet of Things technology in the field of transportation systems.Among them,the IoV realizes information sharing with communication between nodes,which provides a basis of improving traffic efficiency,driving safety and entertainment information services.However,due to the openness of the IoV and the wireless communication between nodes,the communication process between nodes is vulnerable to information tampering attacks,replay attacks,Denial of Service attacks and man-in-the-middle attacks,resulting in the reduction of integrity,confidentiality and availability,which threatens the lives and property of users seriously.So,how to improve the security of communication between nodes in IoV is studied.The main work is as follows:(1)Aiming at the single point of failure problem of centralized safety communication scheme and the vulnerability in distributed safety communication scheme of IoV,combined with the decentralization of blockchain,a secure communication framework based on blockchain proposed.Then analyze the key issues of the access control process and data transmission process in this framework.(2)The access control mechanism based on risk prediction designed for the problem that the node may have attack behavior such as stealing and tampering information on the access information resources,resulting in reduction of confidentiality,integrity and availability in the IoV.Firstly,aiming at the characteristics of behavioral volatility and the small number of training samples in the Internet of Vehicles,a risk prediction model based on the generative adversarial network proposed.Aiming at the low accuracy of prediction and the poor speed of training due to the mode collapse and gradient disappearance during the training process,improving it from the network structure and loss function,and the wasserstein distance based combined generative adversarial network proposed.Finally,the improvement of the training speed and prediction accuracy of the network is verified,and the effectiveness of the access control mechanism in terms of access control accuracy and average response time is verified by experimental comparison.(3)Since the data transmission between the IoV nodes adopts wireless communication,which is vulnerable to man-in-the-middle attacks,resulting in reduction of information confidentiality and integrity.Aiming at the security and real-time requirements of the IoV communication scenario,a secure data transmission scheme based on SSL/TLS(Secure Sockets Layer/Transport Layer Security)protocol is designed.Then,Aiming at the key agreement process of the traditional SSL/TLS protocol,the key agreement is insecure and time-delayed due to the single point of failure of the certificate authority and the slow speed of asymmetric encryption and decryption,from the aspects of public key verification and session reconstruction to improving.Finally,theoretical analysis and experimental comparison show that the key agreement of SSL/TLS protocol has great improvement of the security and efficiency.