Improved Schemes for Visual Cryptography
Designs, Codes and Cryptography
Constructions and Bounds for Visual Cryptography
ICALP '96 Proceedings of the 23rd International Colloquium on Automata, Languages and Programming
A new black and white visual cryptographic scheme for general access structures
INDOCRYPT'04 Proceedings of the 5th international conference on Cryptology in India
Optimal (k, n) visual cryptographic schemes for general k
Designs, Codes and Cryptography
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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.