关键词: 关键词: 区块链, 隐私保护, 可监管, 属性基加密, 链上数据

Abstract: Abstract: To solve the security problems caused by the disclosure of blockchain ledgers, the key lies in the hiding of private information. The use of attribute-based encryption by multi-authority organizations was proposed to achieve privacy protection of blockchain data. Compared to single-attribute institutions, multi-attribute institutions were decentralized and avoid any single point of failure. First, the scheme was modified by the key component generation algorithm, with each authority using the user's identity as a parameter to generate private key components, preventing collusion between nodes to access unauthorized data. Then, identity-based signature technology was modified to establish a connection between user identities and wallet addresses, making the blockchain policeable while also tracing illegal users. Finally, based on the DBDH (Determining the Bilinear Diffie–Hellman) hypothesis, the safety of the scheme was proved in the stochastic prediction model, and compared with the blockchain privacy protection scheme based on ring signature on elliptic curve and the blockchain privacy protection scheme supporting keyword forgetting search, the least amount of time was taken by this solution and it was considered more feasible, in the case of generating the same number of blocks.

Key words: Keywords: blockchain, privacy protection, regulable, attribute-based encryption, on-chain data