Revised elliptic curve cryptography multi-signature scheme (RECC-MSS) for enhancing security in electronic health record (EHR) system.

The article focuses on the development and evaluation of a "Revised Elliptic Curve Cryptography Multi-Signature Scheme" (RECC-MSS) designed to enhance security in transferring patient electronic health records within Internet of Things (IoT)-based smart healthcare systems using blockchain technology. RECC-MSS utilizes medical images as cryptographic keys, extending key size up to 512 bytes through modular multiplication, enabling multi-node accessibility and improved resistance to attacks such as brute force and Sybil attacks. Performance comparisons with established cryptographic hash functions—including various Secure Hash Algorithms (SHA) and MD5—demonstrate that RECC-MSS achieves higher accuracy (93.25%), lower time complexity (1.5 nanoseconds), and greater throughput (17.07 KB per 200 nanoseconds), with statistical significance confirmed via one-way ANOVA tests. The scheme supports decentralized, tamper-proof data sharing among multiple healthcare entities, offering a promising approach for secure, efficient management of sensitive medical data in distributed networks.