基于联盟链的可搜索电子病历双重授权共享方案

doi:10.3969/j.issn.0255-8297.2023.05.013

Abstract

Abstract: Retrieval of electronic medical record (EMR) in cloud environments induces security problems and patient privacy data leakage problems. To this end, a dual-authorization sharing scheme for EMR that supports on-chain keyword ciphertext retrieval is proposed. In the scheme, original medical data ciphertexts are stored in a cloud, and the information of medical data keyword index is constructed with searchable encryption technology and stored on the blockchain. On the premise of obtaining the hospital retrieval authority, a keyword retrieval algorithm under distributed conditions is used to realize the secure re trieval of the medical data ciphertexts. Based on searchable proxy re-encryption algorithm, an authorization on-chain method for the electronic medical data is proposed, which en sures the access control of patients’ medical data and realizes a double authorization of the shared medical data by the hospital and patients. Finally, random oracle model is used to verify the semantic security of the scheme under the assumption of n-QBDH, and the superiority of the scheme in terms of computational cost is proved by experiments.

Key words: consortium blockchain, medical data security sharing, searchable encryption, proxy re-encryption, dual authorization, access control

CLC Number:

TP309.7

MA Xue, PAN Heng, YAO Zhongyuan, SI Xueming. Dual Authorization Sharing Scheme of Searchable Electronic Medical Data Based on Consortium Blockchain[J]. Journal of Applied Sciences, 2023, 41(5): 881-895.

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Dual Authorization Sharing Scheme of Searchable Electronic Medical Data Based on Consortium Blockchain

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