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JAIT 2025 Vol.16(4): 510-526
doi: 10.12720/jait.16.4.510-526

A New Encryption Scheme Using Blockchain for Secured Accessing of Sensitive Health Care Records

Sonya Ansar 1, Prakash Natarajan 1, Liliana Guran 2,3, and Rozalia Veronica Rus 2,*
1. Department of Information Technology, B. S. Abdur Rahman Crescent Institute of Science and Technology, Vandalur, India
2. Department of Hospitality Services, Babeș-Bolyai University, 7 Horia Street, Cluj-Napoca, Romania
3. Department of Computers, Technical University of Cluj-Napoca, 28 G. Barițiu Street, Cluj-Napoca, Romania
Email: sonya@crescent.education(S.A.); prakash@crescent.education(P.N.); liliana.guran@ubbcluj.ro(L.G.); veronica.rus@ubbcluj.ro (R.V.R.)
*Corresponding author

Manuscript received November 6, 2024; revised December 12, 2024; accepted December 11, 2024; published April 16, 2025.

Abstract—Safe storage and retrieval of private patient information has become crucial as healthcare facilities rapidly move to digital. Electronic Health Records (EHRs) have transformed healthcare by streamlining management and enabling seamless sharing among stakeholders, including doctors, laboratory technicians, and insurance agents. However, this digital shift has also exposed EHRs to cyber threats, such as hacking and data breaches. Once compromised, the integrity of the health records is permanently affected. Therefore, it is crucial that patients have complete control over who can access their EHRs, when they can access them, and under what circumstances. This is why it is necessary to design a cloud-based system that helps to ensure authentication and keeps the health records integrity. We propose a novel methodology called Effective Key-length Tri iterative Elliptic-Integrated Data Encryption Standard (EKT-EDES) combined with a blockchain-driven safety mechanism to protect healthcare records in the cloud. This includes encrypting healthcare insurance records before saving them on the Interplanetary File System (IPFS). Enhanced Role-Based Access Control (RBAC) is implemented via Smart Contracts (SC) on the blockchain, which also stores an encoded keyword index for a safe Electronic Medical Records (EMRs) search. Our performance analysis shows key generation time (3 ms), encryption (1628 ms), decryption (1087 ms), execution (3295 ms), latency (107 ms), and throughput (120 ms). We conclude by comparing SC’s total price and throughput, demonstrating the superiority of our method.
 
Keywords—healthcare, blockchain, Electronic Medical Records (EMR), Smart Contract (SC), access control, Effective Key-length Tri-iterative Elliptic-integrated Data Encryption Standard (EKT-EDES)

Cite: Sonya Ansar, Prakash Natarajan, Liliana Guran, and Rozalia Veronica Rus, "A New Encryption Scheme Using Blockchain for Secured Accessing of Sensitive Health Care Records," Journal of Advances in Information Technology, Vol. 16, No. 4, pp. 510-526, 2025. doi: 10.12720/jait.16.4.510-526

Copyright © 2025 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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