Visual Cryptography

  title={Visual Cryptography},
  author={Moni Naor and Adi Shamir},
In this paper we consider a new type of cryptographic scheme, which can decode concealed images without any cryptographic computations. The scheme is perfectly secure and very easy to implement. We extend it into a visual variant of the k out of n secret sharing problem, in which a dealer provides a transparency to each one of the n users; any k of them can see the image by stacking their transparencies, but any k 1 of them gain no information about it. A preliminary version of this paper… CONTINUE READING
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