Steganalysis of Secret Messages Using the Blockiness Method on Stego Color Images

Information hiding is the art of concealing the existence of communication using embedded concealed letters inside unhurt, shown covering color images, detection of hiding, estimate of letters, and its extraction, which belong in the field of steganalysis.Sometimes, there are important messages hidden inside stego-color images.Due to the difficulty of extracting secret messages from color images, this paper proposed a system using the blockiness method to detect and extract secret messages from stego-color images.Using several steps: in the first step, split the size of the stego-color image for 88 blocks; in the second step, decompose each block for one domination array according to the size of the image of each block, then search for a hidden message.In the last step, it found a secret message from each pixel in each block by blockiness to find the binary bit from pixels to extract the secret message; this involves converting the binary bit to decimal and converting it to ASCII characters that generate a set of symbols that compress the secret message.The results obtained are efficient, fast, and powerful in detecting secret messages and transparency, by using several measurements, PSNR, MSE, Entropy, correlation, histogram, and capacity to detect the secret message in stego-color images.