Research on data access scheme based on attribute-based encryption in blockchain environment
Liang Yan, Lina Ge, Jingya Xu · 2023
Access control on shared data can limit illegal access and improve data privacy and security. Attribute-based encryption is one of the key technologies to realize fine-grained access control of data. Traditional access control schemes usually rely on third parties, require high trust overhead, and lack mature encryption technology and access authentication countermeasures, which are vulnerable to adversary attacks and data leakage. In order to solve the above problems, this paper proposes a data access scheme based on attribute-based encryption in blockchain environment. We employ an improved ciphertext-policy attribute-based encryption (CP-ABE) algorithm to provide fine-grained access to data under policy concealment. Simultaneously, we use proxy encryption and decryption to reduce the computing power consumption of users, and introduce decryption tests to verify the correctness of proxy decryption. In addition, combined with blockchain technology, the secure storage and fair authorization of metadata ciphertext are realized. Security analysis proves that this scheme is resistant to selective plaintext attacks. Simulation experiments show that the encryption time of this scheme is less than 200ms for users within 50 attributes, and the decryption time is stable at about 3ms, which has a low computational cost.