Research On Privacy Protection Authentication Scheme Of Internet Of Vehicles Based On Blockchain

With the rapid development of 5G,cloud computing,the Internet of things and other technologies,the Internet of Vehicles has gradually become the core technology for realizing smart city and intelligent transportation.The rapid development of the Internet of Vehicles also brings security challenges such as data storage and processing,disclosure of user information,and privacy protection.Traditional centralized data storage and management method have the problem of a single point of failure,which will bring a series of security risks.As an effective technology of distributed storage and security management,blockchain technology is applied to the Internet of Vehicles and the decentralized architecture of the Internet of Vehicles is studied to improve the security of the Internet of Vehicles,solve big data management and storage problems,and protect the privacy of users,which has certain theoretical significance and practical application value.Due to the openness of the Internet of Vehicles and the high-speed mobility of vehicles,authentication and privacy issues are urgent problems to be solved in the Internet of Vehicles.In addition to protecting the identity privacy of vehicles,privacy protection authentication is considered to be an effective means to resist attacks.The reliability of the messages and the validity of the identities to prevent internal vehicles from broadcasting forged information could be verified by authentication mechanisms while protecting vehicle privacy against tracking attacks.Based on the study of blockchain technology and privacy protection authentication scheme of Internet of Vehicles,a privacy authentication scheme of Internet of Vehicles based on blockchain is proposed,and a distributed identity authentication protocol combined with cloud chain is designed.The specific content is as follows:(1)A blockchain-based privacy protection authentication scheme for the Internet of Vehicles is proposed.Combined with blockchain technology,a distributed Internet of vehicles system architecture is designed,and Road Side Units(RSUs)are used as network nodes in the blockchain network system,which are used to solve the single point of failure problem caused by centralization.The distributed consensus algorithm is used to achieve system consistency and improve system security and scalability.The public key of vehicles,the connectivity between vehicles' real identity and the pseudonymous identity,and the hash value of the transaction are stored in the blockchain,and the vehicle traffic announcement information is stored in the distributed cloud server to realize the harm of user privacy being protected and forged information being spread.The MPT tree is used to extend the traditional blockchain structure,which is realized anonymous vehicle authentication.The malicious vehicles' identity information could be deleted through the hashing operation,which is used to improve the authentication efficiency and reduce the system overhead.Trusted execution technology is used to build a hardware-protected high-security authentication environment,enhance the computing security of the authentication process,and further improve the security,performance,and privacy of the system.The security verification and analysis of the scheme show that the scheme can achieve conditional privacy protection,low resistance to tamper attack and anti-joint attack,and meet the requirements of anonymous authentication of Internet of vehicles.(2)Based on the distributed architecture of the Internet of Vehicles based on the trusted cloud chain,a distributed identity authentication protocol is proposed,and the authentication process between vehicles is simplified through the extended block chain structure,to realize the efficient distributed authentication between vehicles.Combined with the certificateless cryptography mechanism and key isolation technology,the temporary key of vehicles is constantly updated,which is solved the key escrow problem and effectively reduced the storage load of the system.TA distributes the identity for each registered vehicle and generates the mapping value between the real identity and the identity representation,which is realized conditional privacy protection.The batch authentication of messages is carried out by using the non-bilinear operation to improve the efficiency of authentication effectively.Based on the difficulty of the discrete logarithm of an elliptic curve and the assumption of the security of classical cryptography algorithm,the random oracle model proves that the scheme could be met the security performance of key isolation security,anonymous communication,and conditional privacy protection.Meanwhile,the safety comparison with other schemes shows that the security of the proposed scheme is further strengthened and could be met various security requirements of the Internet of Vehicles.(3)The network topology is constructed and different traffic road scenarios are simulated on the OMNET++ simulation platform.The simulation experiment shows the effectiveness of the proposed scheme.