Medical Image Encryption Scheme Based On Hybrid Chaotic Permutation

J.B. Akan¹ , E.A. Adedokun² , G. Onuh³ , A. Umar⁴ , R.I. Nwosu⁵ , Y. Ibrahim⁶

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.4 , pp.97-104, Aug-2020

Online published on Aug 31, 2020

Copyright © J.B. Akan, E.A. Adedokun, G. Onuh, A. Umar, R.I. Nwosu, Y. Ibrahim . 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.
 

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Abstract :
Securing patient?s information in form digital image from unauthorized modification is a crucial concern in modern day information system. With respect to this, a variant of chaos-based image encryption algorithm is proposed for securing medical images, catering for the challenges observed in the chaos-based image encryption algorithm. In the proposed improved algorithm a hybrid permutation approach based on bit-level and block scrambling is used for shuffling pixel after which, chaotic random data with pixel format and inserted on the plain-image surrounding. The plain image is divide into 8 variable sub blocks, then a 3D logistic map is used for generation of scrambling sequence. A combination of bit-level and block level pixel scrambling process was performed using the generated scrambling sequence, before image pixel diffusion process is performed. Simulation results showed an improve performance with respect to information entropy distribution of image in the adjacent direction which greatly reduces pixel correlation and strong redundancy, NPCR and UACI respectively. Thus, the proposed algorithm shows high robustness, sensitivity and resistance to chosen plaintext, known plaintext and chosen cipher text attack

Key-Words / Index Term :
Medical Image Encryption, Chaotic Cryptography, Differential Attacks, Pseudorandom Key-stream, Pixel Scrambling

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