基于CP-ABE和区块链的数据安全共享方法

数据共享是打破大数据时代“数据孤岛”困境的有力途径,而如何保证数据安全共享是当前面临的主要问题.为此,本文基于区块链技术和密文—策略基于属性的加密（Ciphertext-Policy Attribute-Based Encryption,CP-ABE）提出DOB框架,使用智能合约和序列化方法将CP-ABE的系统公钥、用户属性、密文和用户密钥等存储在链数据库中,同时设置数据库的访问权限和注册认证数据集,实现数据的细粒度共享.实验结果表明：相比于Jemel等人提出的Timely CPABE with Blockchain方案,DOB框架能进一步提高数据共享的安全性.

Data Security Sharing Method Based on CP-ABE and Blockchain

Data sharing is a powerful way to break the "Data Isolation" dilemma in the era of Big Data and how to ensure the safe sharing of data is the main problem that we face at present. Therefore, in this study, we propose a DOB framework by using Blockchain technology and ciphertext-policy attribute-based encryption. The system public key, user''s attribute, ciphertext, and user secret key of the CP-ABE are stored in the Blockchain database through the smart contract and serialization method, and the access authority of the database and the registration authentication dataset are deployed to implement fine-grained sharing of data. The experimental results show that compared with the Timely CP-ABE with Blockchain scheme by Jemel et al, the proposed framework further improves the security of data sharing.