Blockchain-assisted Revocable Hierarchical Attribute-based Encryption Electronic Medical Record Sharing Scheme
Xiaotao Yang, Zaibin Chang, Man Jiang · Journal of big data and computing. · 2024
The integration of modern medical systems with the internet of things has significantly improved medical services. Nevertheless, the widespread outsourcing of electronic medical records to third-party cloud storage introduces numerous security challenges, including privacy breaches, data tampering, unauthorized access, and storage limitations. To mitigate these issues, this paper introduces a novel blockchain-assisted revocable hierarchical attribute-based encryption scheme for electronic medical record sharing. This scheme leverages a decentralized blockchain system to manage user revocation and key management tasks, thereby alleviating the need for user ciphertext re-encryption. Additionally, employing ciphertext policy attribute-based encryption enhances access control granularity and safeguards user privacy by concealing access policies. Performance analysis indicates superior performance of the proposed scheme.