关键词: 区块链, 隐私保护, 身份标识密码, 代理重加密, 数据管理

Abstract: Aiming at the problem of personal privacy leaking and the ownership of digital information that individuals can not control, a data management scheme based on blockchain is proposed. This paper combines access control and outofchain storage based on blockchain. Users can effectively manage digital personal information and share_authorized information. Firstly, IBC is used to generate public and private keys for users, which reduces the key management process of certificatebased public key infrastructure, and provides the possibility for supervision and audit. Then, proxy reencryption technology is used to provide security for data storage outside the chain. Extrachain storage is used to reduce the pressure of blockchain storage, improve the efficiency of block construction, and protect data security while ensuring the transparency of blockchain. Finally, the performance and advantages of the proposed scheme are analyzed.

Key words: blockchain, privacy-preserving, IBC, proxy re-encryption, data management