Extended visual cryptography schemes

Visual cryptography schemes have been introduced in 1994 by Naor and Shamir. Their idea was to encode a secret image into n shadow images and to give exactly one such shadow image to each member of a group P of n persons. Whereas most work in recent years has been done concerning the problem of qualified and forbidden subsets of P or the question of contrast optimizing, in this paper we study extended visual cryptography schemes, i. e. , shared secret systems where any subset of P shares its own secret.

Authors

• Andreas Klein
• Markus Wessler

Keywords

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