A New Method for Image Security and Data Hiding in Image

For image security the cryptography algorithm should be applied to every pixels of image and in the receiver side all of the pixels must be decoded. Coding and decoding image, therefore, takes a lot of time because of its huge number of pixels. A common and faster solution for image security is image-hiding instead of image coding. In fact in this method, pixels of the image will be hidden in another image called cover image and in the network cover image distribute, in the receiver side image will be extracted from cover image. Commonly image-hiding algorithms work in frequency-domain, make a lot of changes to the cover image and they are time consuming. In this paper an image-hiding algorithm is introduced that works in spatial-domain. Our algorithm is faster and makes a little change to the cover image indistinguishable by human eyes. Our method uses the difference of pixels instead of the color of pixels.