基于属性基加密的区块链隐私保护与访问控制方法

A Method of Privacy Preserving and Access Control in Blockchain Based on Attribute-based Encryption

区块链中所有节点都保存相同样本,随着区块链技术的广泛应用,区块链隐私保护与访问控制问题日益突出。文章基于多授权中心的属性基加密算法提出了面向区块链的隐私保护与访问控制方案。多授权中心可以由区块链中的权威节点轮值担任,有效解决了单一授权中心权限过大的问题。采用该方案后,所有数据采用属性基加密算法加密后保存在区块链中,只有属性满足访问控制策略的用户才能成功解密数据,从而实现区块链中的隐私保护与访问控制。

All nodes in the blockchain keep the same information.With the wide application of blockchain technology,the problem of blockchain privacy protection and access control is becoming increasingly prominent.Based on multi-authority attribute-based encryption(MA-ABE),this paper proposes a privacy preserving and access control scheme for blockchain.The authorities are acted by the nodes in blockchain,which effectively solves the problem that the centralized authority is too large.By deploying the proposed scheme,data are encrypted by using MA-ABE and stored in the blockchain.Only users whose attributes meet the access control policy can decrypt the data successfully, which achieves the purpose of privacy preserving and access control in blockchain.