Privacy-preserving Electronic Medical Records Sharing Solution Based on Blockchain

In the era of big data, the extensive applications of electronic medical records (EMRs) improve the efficiency of consultations and patient data management. However, it may cause privacy leakage and data damage during inappropriate uses. Fortunately, the advantages of blockchain, such as anonymity, decentralization, and immutability, can provide a favorable platform for health data sharing. This paper proposes a privacy-preserving EMRs sharing scheme based on blockchain. In our scheme, we offer the fine-grained access control property using an identity-based signcryption scheme and ensure no single point of failure through the interplanetary file system (IPFS). Furthermore, for traceability, smart contracts and blockchains are jointly used to record the processes of data storage and access. In the end, we make a security analysis of our proposed scheme to illustrate that it can meet data privacy and integrity requirements. Moreover, we conducted several experiments by timing the consumption of data encryption and decryption to indicate that our work has a lower computation cost than other related works. © 2022,International Journal of Network Security. All Rights Reserved.