Particle Swarm Optimization Algorithm Based Methodology for Breaking the Chi-Square Attack in Steganalytic Systems
Mohammad Hamghalam, Sattar Mirzakuchaki · 2012
Abstract: Steganalytic techniques are used to detect whether an image contains a hidden message. By analyzing different image features between stego-images (the image within which information is hidden) and cover-images (the Image in which information is to be hidden), a steganalytic system is able to detect stego-images. In this paper, we present a new method in LSB embedding by avoiding the change of statistic features. After embedding data in the first LSB bits, we apply PSO (Particle Swarm Optimization) by adjusting the second LSB bits of a stego-image while creating the desired statistic features to generate the modified stego-images that can break the inspection of chi-square attack. Experimental results show that our algorithm can not only pass the detection of chi-square test, but also leave our hidden message unchanged on the first LSB bit and enhance the peak signal-to-noise ratio of stego-images. By using PSO algorithm, speed of convergence also is improved. Key words: Steganalytic systems Stego-images Chi-square attack PSO algorithm