1. School of Information Science and Engineering, Hangzhou Normal University, Hangzhou 311121, China 2. College of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China
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.
Xue-jiao LIU,Yi-dan YIN,Wei CHEN,Ying-jie XIA,Jia-li XU,Li-dong HAN. Secure data sharing scheme in Internet of Vehicles based on blockchain. Journal of ZheJiang University (Engineering Science), 2021, 55(5): 957-965.
Tab.1Comparison with other data sharing schemes in IoV
Fig.5Simulated map of data sharing scene
参数
数值
车速
60 km/h
RSU内车辆密度
[10，50]
DSRC通信范围
0~500 m
数据传输速率
250 kb/s
OBU配置
1.5 GHz，4 core CPU
RSU配置
1.8 GHz，4 core CPU，237 G hard disk
Tab.2Simulation parameters of data sharing scene
Fig.6Encryption efficiency of vehicle
Fig.7Transmission size of ciphertext of vehicle to RSU
Fig.8Trust of malicious nodes
Fig.9Consensus time of RSU
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