A blockchain-based keyword search scheme with dual authorization forelectronic health record sharing br

【Author】 Yang, Xiaodong; Wang, Jiaqi; Xi, Wanting; Tian, Tian; Wang, Caifen

【Source】JOURNAL OF INFORMATION SECURITY AND APPLICATIONS

【影响因子】4.960

【Abstract】Electronic health record is an electronic file that records people's medical treatment and physical examinationinformation in an all-around way which is an important branch of building a smart medical system. The sharingof electronic health records not only helps people use medical resources anytime and anywhere to deal withtricky physical conditions but also provides valuable and true reference materials for medical practitionersin related research. However, the current electronic health record sharing schemes have the problems ofelectronic health record data leakage, access authorization mechanism incomplete, inflexible operation ofelectronic health record data, low search efficiency, and untrustworthy cloud server provider. To solve thesechallenging problems, we propose a new blockchain-based keyword search scheme with dual authorizationfor electronic health record sharing. The certificateless cryptosystem avoids certificate management and keyescrow. The construction of the authorization matrix realizes the dual authorization of the identities of usersand the corresponding searchable departments. Also, the matrix can manage the access rights of users. Thesignal value of the ciphertext index can realize the authority management of ciphertext index. The ciphertextMAC verification code stored in the blockchain can verify the legality of ciphertext, and the smart contract isused to ensure fair transactions. Therefore, our scheme is more suitable for sharing confidential and sensitiveelectronic health records. The security proof concludes that the proposed scheme is indistinguishability underthe keyword guessing attack. Besides, the result of performance analysis and comparison simulations showthat the proposed scheme has higher performance than some related schemes

【Keywords】Authority management; Blockchain; Certificateless cryptosystem; Dual authorization; Electronic health record

【发表时间】2022 MAY

【收录时间】2022-05-27

【文献类型】理论性文章

【主题类别】

区块链应用-实体经济-医疗领域