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27

IANDC
2007

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Extended visual cryptography schemes

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Extended visual cryptography schemes

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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.

Andreas Klein, Markus Wessler

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Added	14 Dec 2010
Updated	14 Dec 2010
Type	Journal
Year	2007
Where	IANDC
Authors	Andreas Klein, Markus Wessler

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