Chaotic Image Encryption Scheme Based on S-Box Substitution

In present work, an encryption scheme is proposed which involves confusion and diffusion process for secure data transmission. The proposed algorithm involves the use of chaotic map, Arnold Cat Map, to produce the confused image. Furthermore, S-box transformation and XOR operation is used to provide diffusion. The process involves the use of 128-bit random key, the bytes of which is substituted with the values of s-box. The substituted values are then applied to the process of row shift and mix column to obtain the final encryption key. This key is XORed with the confused image to obtain the final encrypted image.

I. Introduction

In today's world, the use of images has become common in many important applications which includes medical fields, military, industrial sector, social media, etc. Because of unauthorized handling and usage of such images, it is mandatory to protect the data or images being transmitted. Encryption of image being sent could be a solution to this problem.