MedShare: A Privacy-Preserving Medical Data Sharing System by Using Blockchain

【Author】 Wang, Mingyue; Guo, Yu; Zhang, Chen; Wang, Cong; Huang, Hejiao; Jia, Xiaohua

【Source】IEEE TRANSACTIONS ON SERVICES COMPUTING

【影响因子】11.019

【Abstract】Electronic Health Record (EHR) and its privacy have attracted widespread attention with the development of the healthcare industry in recent years. As locking medical data in a single healthcare center causes information isolation, healthcare centers are motivated to build medical data sharing systems. However, existing systems highly rely on the trusted centralized servers, which are vulnerable to distributed denial of service (DDoS) attacks and the single point of failure. Moreover, it is a non-trivial matter to authorize multiple users to search and access EHR in a privacy-preserving manner. In this article, we propose MedShare, a decentralized framework for secure EHR sharing. Our design utilizes the smart contract technique of blockchain to establish a trusted platform for healthcare centers to share their encrypted EHR. Considering that fine-grained access control is essential in practical EHR sharing service, we devise a constant-size attribute-based encryption (ABE) scheme, where the access policy is embedded in search result on the blockchain. Besides, we propose an efficient scheme that enables authorized MedShare users to perform multi-keyword boolean search operations over encrypted EHR. We formally analyze the security strengths and implement the system prototype on Ethereum. Evaluation results demonstrate that MedShare is efficient for EHR sharing.

【Keywords】Blockchains; Medical services; Cryptography; Servers; Encryption; Smart contracts; Indexes; Searchable encryption; decentralized framework; medical data sharing; attribute-based encryption; boolean search

【发表时间】2023 1-Jan

【收录时间】2023-05-08

【文献类型】理论模型

【主题类别】

区块链应用-实体经济-医疗领域