基于CP-ABE算法的区块链数据访问控制方案

Blockchain data access control scheme based on CP-ABE algorithm

与公有链不同,联盟区块链超级账本Fabric额外集成了成员管理服务机制,能够提供基于通道层面的数据隔离保护。但这种数据隔离保护机制在通道内同步的仍是明文数据,因此存在一定程度的数据泄露风险。另外,基于通道的数据访问控制在一些细粒度隐私保护场景下也不适用。为了解决上述提及的联盟链超级账本中存在的数据隐私安全问题,提出了一种基于CP-ABE算法的区块链数据访问控制方案。结合超级账本中原有的Fabric-CA模块,提出的方案在实现用户级细粒度安全访问控制区块链数据的同时,还能够实现对CP-ABE方案中用户属性密钥的安全分发。对该方案进行的安全分析表明,该方案实现了ABE用户属性私钥安全分发和数据隐私性保护的安全性目标,性能分析部分也说明了所提方案具有良好的可用性。

Different from the public chain,the consortium blockchain Hyperledger Fabric integrates the additional member management service(MSP)mechanism to provide channel-based data isolation protection.However,the data isolation protection mechanism still synchronizes the plaintext data within a channel,so there is a risk of data leakage.Besides,the channel-based data access control mechanism does not apply to some fine-grained privacy protection scenarios.To solve the problems of data privacy and security involved in the consortium chain Hyperledger mentioned above,a blockchain data access control scheme based on the CP-ABE algorithm was proposed.Based on the original existing Fabric-CA module in the Hyperledger,our scheme can realize the secure distribution of user attribute keys in the CP-ABE scheme while implementing the fine-grained security access control of blockchain data at the user level.The security analysis shows that the scheme achieves the security goals of ABE user attribute private key security distribution and data privacy protection.The performance analysis also shows that the proposed scheme has good usability.