Visual Cryptography Technique for Color Images Using Decomposition Method
Visual cryptography, the latest cryptographic technique, is used for the decryption of encrypted photos through human eyes. It doesn't require either cryptography or complicated programming. It also means that hackers are not able to see any clues regarding a hidden picture from each cover. Since Naor and Shamir have suggested the simple visual encryption model, several similar research studies have been written. However, most of these experiments rely on binary images, with just a few indicated gray-level and colour graphic processing techniques. This paper presents three methods for digital encryption of grey and colour-level images, which have been based on studies of previous digital encoding in black and white, half-tone and the colour decomposition technique. We do not only preserve the ability of visual encryption in black and white, which requires a human visual system to decrypt cached images without computing them, but they can also be used conveniently for gray-level or colour images, as well as reverse-compatible with previous Black and White visual encrypting results, including t from the threshold system.