Secure data sharing scheme in Internet of Vehicles based on blockchain

The data is easy to be tampered and the access control of data is not flexible in the Internet of Vehicles (IoV). A secure data sharing scheme based on blockchain and ciphertext-policy weighted attribute-based encryption was proposed aming at the above problem. In this scheme, roadside units jointly maintain the generation, verification and storage blocks to achieve distributed storage of data, which ensures the data from being tampered. Attribute-based access control ensures that only authorized entities can access the content of data on the blockchian. A hierarchical access policy formulation method based on multi-attribute was proposed to reduce the complexity of access control policy aiming at the data sharing requirements among the multiple entities and roles in the IoV, by mining the association of attributes in the roles for data access. Experimental results show that the proposed scheme can realize the secure storage and flexible access control of the data in the IoV, and the hierarchical access policy formulation method can effectively reduce the calculation and transmission overhead of vehicles, and meet the access requirements of multiple entities and roles in the IoV. Copyright ©2021 Journal of Zhejiang University (Engineering Science). All rights reserved.