Application of SS-box and chaotic map for image encryption

In this work we propose a method for image encryption based on chaotic skew tent-map and substitution box transformation. This method provides confusion and diffusion at the same time. It is well known from literature that simple image encryption based on a total shuffling scheme is not secure against different types of attacks. We then projected an extended algorithm which works well against chosen cipher text attacks due to the substitution box operation. Furthermore we analyze the proposed technique for NPCR and UACI analysis to determine its strength.