Abstract: Visual cryptography is a cryptographic paradigm introduced by Naor and Shamir [Lecture Notes in Comput. Sci., Vol. 950, Springer, Berlin, 1995, p. 1]. Some predefined set of participants can decode a secret message (a black and white image) without any knowledge of cryptography and without performing any cryptographic computation: Their visual system will decode the message. In this paper we define and analyze visual cryptography schemes for grey level images whose pixels have g grey levels ranging from 0 (representing a white pixel) to g−1 (representing a black pixel). Moreover, we give a necessary and sufficient condition for such schemes to exist.
Publication Year: 2000
Publication Date: 2000-11-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 209
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