it design---itbox möbelsystem / furniture system---itbed kartonbett gästebett / cardboard bed guestbed---itpet recreative furniture--- it pet Doug Stinson's Visual Cryptography Page last modified April 17, 2003 Visual cryptography was introduced by Naor and Shamir at EUROCRYPT '94. They asked the following intriguing question: is it possible to devise a secret sharing scheme in which an image can reconstructed "visually" by superimposing two shares? Each share would consist of a transparency, made up of black and white pixels. Naor and Shamir devised the following scheme, illustrated in the figure below. A pixel P is split into two subpixels in each of the two shares. Suppose we look at a pixel P in the first share. Now let's consider what happens when we superimpose the two shares (here we refer to the last column of the figure). Since the summer of 1995, I have been involved in research on this topic, partly in collaboration with C. I published an introductory article on visual cryptography in the April 1998 issue of Dr. I have given seminar talks on this topic many times in recent years. Some examples of visual cryptography are provided.
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