BDAE: A Blockchain-Based and Decentralized Attribute-Based Encryption Scheme for Secure Data Sharing  

作　　者：YANG Shuangxi 

机构地区：[1]School of Electronic Information,Wuhan University,Wuhan 430072,Hubei,China

出　　处：《Wuhan University Journal of Natural Sciences》2024年第3期228-238,共11页武汉大学学报（自然科学英文版）

摘　　要：Ciphertext-policy attribute-based encryption(CP-ABE) is widely employed for secure data sharing and access control. However, its dependence on a single authority introduces security and performance challenges. Despite the existence of multi-authority CPABE approaches, persistent issues such as single points of failure and high computation cost on the user side remain. This study proposes a novel solution named blockchain-based and decentralized attribute-based encryption(BDAE) for data sharing. BDAE enhances traditional scheme by integrating blockchain and distributed key generation technology. The scheme employs an(n, t) threshold secret sharing algorithm, coupled with the Pedersen verifiable secret sharing method, for attribute key generation. This combination ensures key credibility,facilitates joint attribute management, and addresses single bottleneck and key verification issues. Integrated into a blockchain system, the scheme utilizes smart contracts for fine-grained access control and outsourced computing. Blockchain's decentralization and access logs make data sharing tamper-resistant and auditable. Moreover, simulation comparisons demonstrate that the scheme effectively reduces decryption overhead on the user side, meeting practical application requirements.

关 键 词：blockchain attribute-based encryption multi-authority verifiable secret sharing access control 

分 类 号：TP311.5[自动化与计算机技术—计算机软件与理论]