Abstract
Ciphertext-policy attribute-based encryption(CP-ABE)is widely employed for secure data sharing and access control.How-ever,its dependence on a single authority introduces security and performance challenges.Despite the existence of multi-authority CP-ABE 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 algo-rithm,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 de-cryption overhead on the user side,meeting practical application requirements.
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