| With the development of Internet of Vehicle(IoV)technology,modern vehicles equipped with advanced in-vehicle systems are constantly generating huge amounts of different kinds of data.This data can be used to improve driving safety and achieve a better quality of service in intelligent transportation systems.However,the sharing of Io V data faces significant security and privacy challenges.Vehicles are reluctant to upload data to an infrastructure with a centralized management structure due to concerns about data leakage,while data is at risk of unauthorized access.Therefore,ensuring efficient and secure data-sharing is a significant challenge.The convergence of Io V and Blockchain can provide a solution to these problems.Based on blockchain technology,this thesis focuses on two aspects of data sharing in Io V: on the one hand,the consensus mechanism is optimized to improve data sharing efficiency and participation;on the other hand,a secure and flexible access control scheme is proposed,which in turn ensures the safety and reliability of Io V environment.The details are as follows:(1)To solve the problem of low data sharing efficiency in Io V,considering the lack of willingness of vehicles to share,this thesis proposes a optimization scheme based on Delegated Proof of Stake(DPo S)consensus mechanism.Firstly,a dual chain structure based on the coalition chain is adopted,and an urgency scoring mechanism is set up to guarantee priority sharing of urgent transactions and improve the efficiency of transaction processing in the data-sharing process.Secondly,the traditional DPo S consensus mechanism is improved by adopting a subjective logic model based on social relationships and introducing a secure and efficient reputation management scheme.Finally,the packet nodes are selected by reputation-based voting,and the node election algorithm is designed to reduce the influence of malicious nodes and motivate nodes to participate in data sharing through the reward and punishment mechanism.The experimental results show that the scheme in this thesis improves the motivation of vehicle participation in data sharing and ensures the safety and reliability of the sharing process.(2)Aiming at the problem of inflexible access control in traditional data sharing and considering the demand for multi-entity access in Io V,this thesis proposes a blockchain-based vehicle networking hierarchical access control scheme.Firstly,grading vehicle data with different sensitivities and merging access control trees for low-sensitive data to simplify the complexity of access control policies.Secondly,the correlation relationship of attribute permissions among Io V data access entities is mined,and a multi-attribute hierarchical access policy generation algorithm is designed.Finally,this thesis design a secure sharing scheme for Io V data based on cryptographic policy attribute encryption,combine symmetric encryption algorithms to control access to private data,ensure that data content is only accessible by authorized visitors,and maintain the security of the data sharing environment.The experimental results show that the scheme in this thesis can achieve secure and flexible access control for Io V data,reduce vehicle computation and transmission overhead,ensure the traceability of the data-sharing process,and realize more reliable access control management. |
