A new approach of image encryption based on dynamic substitution and diffusion operations
Mohamed Essaid, Ismail Akharraz, Abderrahim Saaidi, Ali Mouhib · 2019
This work proposes a solution that provides good security for the transmission of color images through unsecured channels. To achieve this objective, two enhanced chaotic maps, which present more complicated dynamics behaviors are used. In substitution phase, both chaotic maps are employed to create a dynamic substitution table, which not only depends on level grey but also the dimension of the original image, thereby, the table served to substitute each pixel. In diffusion mechanism, the keystream generated by a combination of both chaotic maps is used to cache the random numbers generated and each image pixel, on the one hand, and to link each encrypted pixel to its adjacent, on the other hand. The security analysis in terms of correlation coefficient, entropy, histogram, UACI and NPCR show that the suggested algorithm is secure enough to resist statistical attack, differential attack, and exhaustive attack.