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An image encryption scheme based on a new hybrid chaotic map and optimized substitution box

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Abstract

This paper proposes a new hybrid chaotic map and a different way of using optimization technique to improve the performance of encryption algorithms. Compared to other chaotic functions, the proposed chaotic map establishes an excellent randomness performance and sensitivity. Based on its Lyapunov exponents and entropy measure, the characteristics of the new mathematical function are better than those of classical maps. We propose a new image cipher based on confusion/diffusion Shannon properties. The substitution phase of the proposed encryption algorithm, which depends on a new optimized substitution box, was carried out by chaotic Jaya optimization algorithm to generate S-boxes according to their nonlinearity score. The goal of the optimization process is to have a bijective matrix with high nonlinearity score. Furthermore, a dynamic key depending on the output of encrypted image is proposed. Security analysis indicates that the proposed encryption scheme can withstand different crypt analytics attacks.

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Acknowledgements

The authors would like to thank the anonymous referees for their valuable comments and suggestions that enhanced the content and the form of this paper.

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Authors and Affiliations

  1. Laboratory of Electronics and Information Technology, National Engineering School of Sfax, Sfax University, B.P.W. 3038, Sfax, Tunisia

    M. A. Ben Farah

  2. College of Engineering Hail, University of Hail, Hail, Saudi Arabia

    A. Farah

  3. Control and Energy Management Laboratory (CEM Lab), Sfax, Tunisia

    A. Farah

  4. RISC Laboratory, National Engineering School of Tunis, University of Tunis El Manar, 1002, Tunis, Tunisia

    T. Farah

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  1. M. A. Ben Farah
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Farah, M.A.B., Farah, A. & Farah, T. An image encryption scheme based on a new hybrid chaotic map and optimized substitution box. Nonlinear Dyn 99, 3041–3064 (2020). https://doi.org/10.1007/s11071-019-05413-8

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