New Image Encryption Scheme Based on Dynamic Substitution and Hill Cipher.
Younes Qobbi, Abdeltif Jarjar, Mohammed Essaid and Abdelhamid Benazzi
Published: September 30, 2021
Abstract
In this work, we propose a new color image encryption technique. After transiting of the original image into a vector and decomposing it into blocks of three pixels, along with modifying of a seed block by an initialization vector computed from the plain image, a preliminary confusion will be handled by a substitution matrix developed under the control of the two chaotic maps used in the system. The achieved block will be injected in affine transformation provided by an invertible matrix accompanied by a dynamic translation vector to surmount the problem of null or uniform blocks. The encrypted block will be linked to the original block to setup diffusion and avalanche effect to protect the system from differential attacks. Simulations ap-plied to on a large number of color images prove the robustness of the pro-posed approach against known attacks.
Keywords: Chaotic maps; Affine transformation; Substitution