Medical Image Encryption Scheme Based On Hybrid Chaotic Permutation
Keywords:
Medical Image Encryption, Chaotic Cryptography, Differential Attacks, Pseudorandom Key-stream, Pixel ScramblingAbstract
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
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