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A one-round medical image encryption algorithm based on a combined chaotic key generator

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Abstract

Medical images of patients must be securely transmitted and kept private in telemedicine. To secure such medical images, this paper proposes a single round chaotic image encryption scheme based on a permutation-diffusion structure. A combined chaotic key generator (CCKG) is proposed to enhance key sensitivity and generation in order to improve the security of medical images to be encrypted. CCKG is used to produce the initial seeds for the fractional order chaotic system (FOCS) and Lorenz system (LS) for the permutation and diffusion processes, respectively. CCKG together with proposed permutation and diffusion methods enhances cipher image security in single round. Using zigzag transform (ZT) scanning, the plain image is first permuted block by block. The type of scanning used on each block is heavily influenced by the ZT selection from FOCS and LS. Following block-wise permutation, the permutation order (PO) generated from LS performs overall permutation. Based on the pixel positions, the overall permuted image is divided into odd and even parts. Then these parts of the images are diffused separately by the random pixel matrices generated by LS and FOCS. The cipher image is formed by combining the odd and even parts after diffusion. Secret key analysis, statistical analysis, differential attack analysis, and simulations confirm that with a single round of image encryption, the proposed system is competent, robust and effective.

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Authors and Affiliations

  1. P.A. College of Engineering and Technology, Pollachi, Tamil Nadu, India

    Kumar D &  Ranjithkumar R

  2. Dr. Mahalingam College of Engineering and Technology, Pollachi, Tamil Nadu, India

    Sudha V K

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Kumar D, Sudha V K & Ranjithkumar R A one-round medical image encryption algorithm based on a combined chaotic key generator. Med Biol Eng Comput 61, 205–227 (2023). https://doi.org/10.1007/s11517-022-02703-z

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