Secure Tamper-Resistant Electronic Health Record Transaction in Cloud System Via Blockchain

The widespread usage of cloud-based e-health systems is increasing at a faster pace due to the advancement in managing Electronic Health Record (EHR), disease analysis, providing prescriptions, etc. But, traditional systems are prone to challenges in security during the storage and data transaction. Hence, it is complex to integrate the EHR into the cloud-based system as it affects the privacy of the user. At present, blockchain is used in sharing and analysis of EHR since it provides high security and possesses unique properties such as tamper resistance and decentralized data sharing. Here, we propose cloud-assisted medSupport blockchain for the secure transaction of EHR to the cloud server (CS) and providing medical services to the user. At first, smart registration of patients and doctors into the CS is performed simultaneously and then we generate key-based access control using the Secure Password Authentication based Key Exchange (SecPAKE). For secure EHR transactions, access policies are defined in the smart contract. Also, all the transactions and prescriptions made by the entities are stored in the blockchain. Finally, the performance of the medSupport blockchain is evaluated in comparison with other existing approaches and the proposed model outperforms other traditional methods.