Blockchain-assisted Revocable Hierarchical Attribute-based Encryption Electronic Medical Record Sharing Scheme

Abstract

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.