A Hybrid Cryptosystem for Securing Telemedicine Data Transmission Over Public Networks

International Journal of Computer Science and Technology | Vol. 10, No. 11, November 2008 | pp. 81–88

DOI: 10.46882/2008/IJCST/101120

Research Article

Title: A Hybrid Cryptosystem for Securing Telemedicine Data Transmission Over Public Networks

Names of Authors: Chidi E. Okafor¹, Blessing N. Nwachukwu²

Authors’ Affiliations: ¹Department of Computer Science, University of Nigeria, Nsukka, Nigeria; ²Department of Biomedical Engineering, Federal University of Technology, Owerri, Nigeria

Abstract: Telemedicine applications transmit highly confidential patient health records and diagnostics across open communication channels, creating security risks regarding data intercept and identity theft. This paper details a hybrid cryptographic architecture that secures electronic health records (EHR) and high-resolution medical imagery. The data payloads are encrypted using the Advanced Encryption Standard (AES) with a 256-bit key operating in Cipher Block Chaining (CBC) mode. The ephemeral symmetric AES session keys are concurrently secured using 2048-bit RSA public-key cryptography to enable secure key exchange. Integrity and non-repudiation are verified by appending an SHA-256 digital signature to each transaction packet. Performance profiling showed that the hybrid cryptosystem processes an 8.5 MB MRI image scan within 245 milliseconds on client-side terminals. The encryption process altered data entropy values up to a nearly ideal factor of 7.998 ± 0.001, indicating resilience against statistical cryptanalysis attacks while maintaining compliance with healthcare data privacy mandates.

Keywords: Telemedicine security, hybrid cryptosystem, AES encryption, RSA algorithm, digital signature, medical data privacy

Manuscript Timeline: Received August 5, 2008; Revised September 18, 2008; Accepted October 10, 2008; Published November 4, 2008

Citation: Okafor, C. E., & Nwachukwu, B. N. (2008). A Hybrid Cryptosystem for Securing Telemedicine Data Transmission Over Public Networks. International Journal of Computer Science and Technology, 10(11), 81–88.

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