标题: A new approach for visual cryptography
作者: Tzeng, WG
Hu, CM
资讯工程学系
Department of Computer Science
关键字: visual cryptography;secret sharing;access structure
公开日期: 1-十二月-2002
摘要: 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.
URI: http://dx.doi.org/10.1023/A:1019939020426
http://hdl.handle.net/11536/28344
ISSN: 0925-1022
DOI: 10.1023/A:1019939020426
期刊: DESIGNS CODES AND CRYPTOGRAPHY
Volume: 27
Issue: 3
起始页: 207
结束页: 227
显示于类别:Articles


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