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Visual Cryptography Schemes (VCS) consider the problem of encrypting and sharing images (printed text, hand written notes, pictures, etc.) in a perfectly secure way which can be decrypted directly by the human visual system. A k out of n VCS for is a technique by which a Secret Image (SI) is shared among n users called share-holders, when k or more users stack their shares (transparencies) together, the SI becomes visible, while k-1 or less users gain no information about SI.
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