关键词: 区块链, 电子病历, 智能合约, 数据共享, 动态阈值

Abstract: To ensure the security of electronic health records and patient privacy amidst data security risks from advancing information technology, a novel approach integrating multi-short signatures with dynamic attribute-based encryption is devised. This method facilitates anonymous user authentication, safeguards data privacy, and simplifies data management. The scheme leverages smart contracts and contextual information within a blockchain framework to dynamically adjust thresholds. Furthermore, it incorporates attribute-based key updating alongside proxy re-encryption algorithms to establish a dynamic attribute update mechanism, enabling precise and granular key updates. Developed on the Hyperledger Fabric platform, the solution was tested for verification and dynamic update times. Results indicate that the approach achieves low overhead and high performance.

Key words: blockchain, electronic medical record, smart contract, data sharing, dynamic threshold