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An improved permutation-diffusion type image cipher with a chaotic orbit perturbing mechanism.

Jun-xin Chen, Zhi-liang Zhu, Chong Fu

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    This study introduces an improved chaos-based image cipher that enhances security by integrating permutation and diffusion processes. The novel chaotic orbit perturbing mechanism ensures effective diffusion for secure real-time image transmission.

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    Area of Science:

    • Cryptography
    • Computer Science
    • Information Security

    Background:

    • Chaos-based permutation-diffusion image ciphers are crucial for secure real-time image transmission.
    • Existing methods often treat permutation and diffusion independently, limiting cooperative enhancement.
    • There is a need for integrated approaches to improve image cipher security and efficiency.

    Purpose of the Study:

    • To propose an improved chaos-based image cipher integrating permutation and diffusion.
    • To introduce a novel chaotic orbit perturbing mechanism for enhanced diffusion.
    • To achieve high security with low computational complexity for real-time applications.

    Main Methods:

    • A pixel-swapping mechanism for permutation using pseudorandom locations from chaotic logistic map iteration.
    • A plain pixel-related chaotic orbit perturbing mechanism for effective diffusion.
    • A reverse direction diffusion method to enhance diffusion across the entire image within one round.

    Main Results:

    • The proposed scheme demonstrates a tiny change in the plain image spreads effectively during confusion, creating strong diffusion.
    • The reverse diffusion method ensures the diffusion effect permeates the whole cipher image efficiently.
    • Simulation and cryptanalysis confirm satisfactory security and low computational complexity.

    Conclusions:

    • The integrated permutation-diffusion approach with chaotic orbit perturbation significantly enhances image cipher security.
    • The proposed method is a viable candidate for secure real-time image storage and distribution.
    • The cooperative design of permutation and diffusion offers superior performance over independent methods.