Research On Data Access Control And Customized Services For Intelligent Transportation Based On A Consortium Blockchain

Intelligent transportation system combines sensor,wireless communication and computer technology to build a secure and efficient transportation system.It realizes intelligent traffic control and provides comfortable and convenient services for drivers.However,the onboard unit of the intelligent transportation system communicates in the open wireless environment.Therefore,attackers are easy to eavesdrop,tamper or forge data,threatening the confidentiality of the data.What’s more,data is stored and processed by the trusted center node.The centralized structure requires too much computing power,storage space and security performance of the center node.Once the central node is attacked,the security of the whole network will be threatened.In addition,it’s still a challenge to implement data access control and prevent users’ privacy disclosure when service departments provide customized services for onboard units by using the obtained data.In view of the security challenges in intelligent transportation,this paper proposes a data access control and customized service scheme based on a consortium blockchain.The main research contents include:(1)We propose a secure data sharing and customized services for intelligent transportation based on the consortium blockchain,which uses the blockchain to realize the decentralized storage of data.Attribute-based proxy re-encryption algorithm is proposed to implement keyword retrieval and control data access rights.We analyze the security of the scheme and evaluate its performance.The results demonstrate that our scheme not only meets the security requirements of data sharing,but also has more advantages in computational and communication overheads.(2)We propose an adaptive traffic signal control mechanism for intelligent transportation based on a consortium blockchain,which uses the blockchain to break the central control of signal light regulation.The group signature algorithm is proposed to guarantees the confidentiality,integrity and non-repudiation of data.Moreover,it also provides conditional privacy for the onboard unit,that is,to protect the identity privacy of the vehicle,but there is a dispute,the real identity of the malicious vehicle can be traced and disclosed.We evaluate the algorithm for security analysis,communication overheads,and computational overheads.The results show that our algorithm has better real-time performance and meets the requirements of security and privacy.(3)We propose a secure ride-sharing service based on a consortium blockchain,which uses the improved DPoS consensus mechanism to generate blocks and verify data.The traceability of blockchain is used to arbitrate disputes and expose the real identity of malicious users.The attribute-based proxy re-encryption algorithm we propose not only meets the requirements of unidirectionality,verifiability and confidentiality,but also ensures data security and privacy.Security analysis and performance evaluation prove the advantages of our scheme.