Due to tremendous improvements in the technology, all the confidential information are flying over the internet and most of the secured data are in the form of digital content. In this situation, data hiding techniques like Steganography stands in the position to protect the data in efficient manner from attackers. The style of embedding covert image over the cover image is termed as Image-Image Steganography. Here the methodology used for image- image steganography is modified form of pixel value differencing. Here, the secret image gets hidden in the cover object(image) in which the size of the message image is equivalent to the cover image and it is achieved by using CMYK colour model. Thus, the proposed algorithm provides a stego image with good quality measures and this algorithm is implemented with the help of matlab. Here the disturbance in the resultant image is calculated with the help of its PSNR and MSE values.
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