A STEGANOGRAPHY ALGORITHM FOR HIDING IMAGE IN IMAGE BY IMPROVED LSB SUBSTITUTION BY MINIMIZE DETECTION
Vijay Kumar Sharma, Vishal Shrivastava · 2012
Steganography is a branch of information hiding. It allows the people to communicate secretly. As increasingly more material becomes available electr onically, the influence of steganography on our liv es will continue to grow. Many confidential informatio n were leaked to a rival firm using steganographic tools that hid the information in music and picture files . The application of steganography is an important motivation for feature selection. In recent years, many successful steganography methods have been proposed. They challenge by steganalysis. Steganalysis (type of attack on steganography Algorithm)Algorithm which detects the stego-message by the statistic analysis of pixel values[1][2], T o ensure the security against the steganalysis attack , a new steganographic algorithm for 8bit(grayscale ) or 24 bit (colour image) is presented in this paper, ba sed on Logical operation. Algorithm embedded MSB of secret image in to LSB of cover image. in this n LS B of cover image ,from a byte is replaced by n MSB of secret image. the image quality of the stego-image can be greatl y improved with low extra computational complexity. The worst case mean-square-error between the stego-image and the cover-image is derived. Experimental results show that the stego-image is v isually indistinguishable from the original cover-i mage when n<=4, because of better PSNR which is achieved by this te chnique. It comes under the assumption that if the feature i s visible, the point of attack is evident, thus the goal here is always to cover up the very existence of the emb edded data.