Visual Cryptography (1995) [67 citations — 4 self]
http://www.wisdom.weizmann.ac.il/~naor/PAPERS/vis.
http://www.wisdom.weizmann.ac.il/Papers/CSreports/
DBLP
CACHED:
Abstract:
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.
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