Chaos Image Encryption Followed By the Steganography Technique

Abstract

This paper presents the chaos image encryption technique which is followed by the image steganography. The first layer of this proposed technique is to encrypt the grey scale image by the chaotic map which produce randomizations in the original image and make it secure against any forgery attacks. In this technique the performance of two chaotic maps (bakers map and Arnold cat map) are evaluated and the best evaluated chaotic map (Arnold cat map) is used in the proposed technique. The second layer takes the encrypted image and hides it inside another image (cover image) by the image steganography technique and in the result stego image is formed. Stego image hide the secret information from the eavesdroppers and show only the cover image which is common to all. Matlab simulations and analysis tests like contrast, correlation, homogeneity, histogram analysis and energy that has been performed on the proposed technique to evaluate its strength reveals that the proposed method is resistant against attacks of transmission of images in communication systems.