A Session Based Multiple Image Hiding Technique using Discrete Cosine Transformation

This work proposes a DCT based Steganographic technique for the color image. The true color cover image is decomposed into three separate color planes namely R, G and B. During embedding of secret images into different color planes, images are dispersed among the selected DCT coefficients using a pseudo random sequence and a Session key. Secret images are extracted using the session key and the size of the images from the planer decomposed stego image. In this approach the stego image generated is of acceptable level of imperceptibility and distortion compared to the cover image and the overall security is high.