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Applications of Partially Balanced Incomplete Block Designs in Developing (2,n) Visual Cryptographic Schemes Avishek ADHIKARI Mausumi BOSE Dewesh KUMAR Bimal ROY Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Vol.E90-A No.5 pp.949-951 Publication Date: 2007/05/01 Online ISSN: 1745-1337 DOI: 10.1093/ietfec/e90-a.5.949 Print ISSN: 0916-8508 Type of Manuscript: Special Section LETTER (Special Section on Discrete Mathematics and Its Applications) Category: Keyword: participants, shares, pixel expansion, relative contrast, Full Text: PDF(73.5KB)>>
Summary: The aim of our paper is to show how Partially Balanced Incomplete Block Designs (PBIBD) may be used to construct (2,n) visual cryptographic schemes for black and white images with small pixel expansion. In situations where uniformity of the participants with respect to the relative contrast is not important, our schemes work well since by allowing the relative contrast to vary depending on which two participants are recovering the image, they can keep the pixel expansion quite small. Thus our schemes have considerably smaller pixel expansion than many of the existing schemes. For some n and some pairs of participants recovering the image, our schemes have larger relative contrast than some existing schemes. | ||||||||||
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