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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