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it design---itbox möbelsystem / furniture system---itbed kartonbett gästebett / cardboard bed guestbed---itpet recreative furniture--- it pet meubles en carton marie krtonne 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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