A Chaos-based Image Encryption Scheme Using Permutation-Substitution Architecture

Recently, a great number of chaos-based image encryption algorithms have been proposed. But most of them are either deficient in security or complicated. In this paper, we propose a permutation-substitution image encryption scheme based on generalized Arnold map. Only one round of permutation and one round of substitution are performed to get the desirable results. The generalized chaotic Arnold maps are applied to generate the pseudo-random sequences for the permutation and substitution. The permutation and substitution are both performed row-by-row/column-by-column instead of pixel-bypixel to increase the speed of encryption. The security and performance of the proposed scheme have been analyzed, including statistical analysis, key sensitivity analysis, key space analysis, differential analysis, encryption rate analysis etc. All the experimental results suggest that the proposed image encryption scheme is efficient and highly secure.