Extended visual cryptography systems

Details Extended visual cryptography systems Extended visual cryptography systems

2003-02-04

arxiv.org/abs/math/0302043v1

Mathematics

Combinatorics

10 pages

Scientific paper

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.

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