A New Approach for Visual Cryptography

Authors:
Wen-Guey Tzeng;Chi-Ming Hu
Affiliations:
Department of Computer and Information Science, National Chiao Tung University, Hsinchu, Taiwan 30050 Tel.: 886-3-5712121 ext. 56608, Fax: 886-3-5721490 tzeng@cis.nctu.edu.tw;Department of Computer and Information Science, National Chiao Tung University, Hsinchu, Taiwan 30050
Venue:
Designs, Codes and Cryptography
Year:
2002

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Abstract

Visual cryptography is to encrypt a secret image into some shares (transparencies) such that any qualified subset of the shares can recover the secret “visually.” The conventional definition requires that the revealed secret images are always darker than the backgrounds. We observed that this is not necessary, in particular, for the textual images.In this paper, we proposed an improved definition for visual cryptography based on our observation, in which the revealed images may be darker or lighter than the backgrounds. We studied properties and obtained bounds for visual cryptography schemes based on the new definition. We proposed methods to construct visual cryptography schemes based on the new definition. The experiments showed that visual cryptography schemes based on our definition indeed have better pixel expansion in average.