Chaotic Image encryption using Arnold’s cat map and mod function with an auxiliary image key

Abstract

In the last decade a significant progress has been achieved by computer specialist in the field of information security and guarantee confidently deliver the information Especially the images to authorized persons, the article in our hand introduces a procedure for Image encryption and decryption based on hybrid chaotic system which it organized into two primary steps, firstly using Arnold cat map (ACM) on an image as a chaotic system.  Secondly, enhanced the first step with use modulo function and (XOR) logical function of auxiliary image with the image of the first step of obtain extra security level , in evaluating the proposed algorithm, three key performance indicators are considered, the MSR, PSNR and the Entropy adding to these a visual inspection of the result images, Analysis reveals that the algorithm's extensive key space and heightened sensitivity to minimal key changes make it robust against brute-force attacks, and it also immune against statistical attacks due to the entropy values results exceed 7.3 for the result images.