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

M. A. Ben Farah, A. Farah, T. Farah

Research output: Contribution to journalArticlepeer-review

192 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3041-3064
Number of pages24
JournalNonlinear Dynamics
Volume99
Issue number4
Early online date11 Dec 2019
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • encryption
  • hybrid map
  • nonlinearity
  • optimization
  • randomness
  • S-box

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