Block chain enabled hybrid cryptographic algorithm for security and privacy preservation of electronic health records

With recent trends, the cloud-computing paradigm has gained significant attention, especially in patient health monitoring applications. To date, several cryptographic methods have been introduced to accomplish secure medical data access and storage in cloud service providers. However, these methods have failed to strike a balance among the demands of Electronic Health Records (EHRs) security solutions. Blockchain-based technology is a practical option for managing individual EHRs, as it offers an advanced solution for enhancing the privacy and security of medical data. Therefore, this research proposes a hybrid cryptographic algorithm: Secure Hash Algorithm-256 (SHA-256) combined with Composite Logistic Sine Map (CLSM), namely SHACLSM, with Proxy Re-Encryption (PRE). Overall, the effectiveness of the proposed SHACLSM is analyzed in terms of scalability, computational delay, latency, transaction time, hash verification time, and hash generation time. The outcomes clearly indicate that the proposed SHACLSM-PRE cryptographic algorithm requires minimal transaction time, latency, hash generation time, and hash verification time when evaluated against conventional algorithms, namely Advanced Encryption Standard (AES), SHA-256, Elliptic Curve Cryptography (ECC), Rivest-Shamir-Adleman (RSA), and AES New Instructions (AES-NI).