IMAGE ENCRYPTION BY USING THE OPTIMIZED SUBSTITUTION BOX: A REVIEW ARTICLE

Abstract

This paper introduces a modern hybrid chaotic map and a different way to enhance the efficiency of encryption algorithms by using optimization techniques. The suggested chaotic map establishes an outstanding efficiency and sensitivity to randomness compared to other chaotic functions. The characteristics of the new mathematical function are better than those of classical maps on the basis of its Lyapunov exponents and entropy index. We suggest a new image cypher based on the Shannon properties of confusion/diffusion. The replacement step of the proposed encryption algorithm, which relies on a new optimized replacement box, was carried out to generate S-boxes according to their nonlinearity score via the chaotic Jaya optimization algorithm. The purpose of the optimization process is to have a high nonlinearity rating bijective matrix.