combining and steganography of 3-d face textures

One of the serious issues in communication between people is hiding information from the others, and the best way for this, is to deceive them. since nowadays face images are mostly used in three dimensional format, in this paper we are going to steganography 3-d face images and detecting which by curious people will be impossible. as in detecting face only, its texture is important, we separate texture from shape matrices, for eliminating half of the extra information. steganography is done only for face texture, and for reconstructing a 3-d face, we can use any other shape. moreover, we will indicate that, by using two textures, how two 3- d faces can be combined. for a complete description of the process, first, 2-d faces are used as an input for building 3-d faces, and then 3-d face and texture matrices are extracted separately from the constructed 3-d face. finally, 3-d textures are hidden within the other images.