Attribute-based Multi-Signature and Encryption for EHR Management: A Blockchain-based Solution
This addresses security and privacy issues in EHR management for healthcare systems, but it is incremental as it combines existing blockchain and encryption methods.
The paper tackles the problem of securing Electronic Health Record (EHR) data by proposing a hybrid blockchain and edge node architecture that uses attribute-based multi-signature and encryption schemes, with experiments measuring signing and verifying times under different settings.
The global Electronic Health Record (EHR) market is growing dramatically and has already hit $31.5 billion in 2018. To safeguard the security of EHR data and privacy of patients, fine-grained information access and sharing mechanisms are essential for EHR management. This paper proposes a hybrid architecture of blockchain and edge nodes to facilitate EHR management. In this architecture, we utilize attribute-based multi-signature (ABMS) scheme to authenticate user's signatures without revealing the sensitive information and multi-authority attribute-based encryption (ABE) scheme to encrypt EHR data which is stored on the edge node. We develop the blockchain module on Hyperledger Fabric platform and the ABMS module on Hyperledger Ursa library. We measure the signing and verifying time of the ABMS scheme under different settings, and experiment with the authentication events and access activities which are logged as transactions in blockchain.