On the Pixel Expansion of Visual Cryptography Scheme

On the Pixel Expansion of Visual Cryptography Scheme

Teng Guo (University of International Relations, China), Jian Jiao (University of International Relations, China), Feng Liu (Chinese Academy of Sciences, China) and Wen Wang (Chinese Academy of Sciences, China)
Copyright: © 2020 |Pages: 8
DOI: 10.4018/978-1-7998-1763-5.ch031
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In this paper, we first follow Ateniese et al.'s work that provides upper bounds of the pixel expansion of visual cryptography schemes(VCSs) for more kinds of graph access structures, in which we require that a subset of parties can determine the secret if they contain an edge of the graph G. The constructive upper bounds are derived by the graph decomposition technique. Then we generalize Ateniese et al.'s method of comparing the optimal pixel expansion of VCSs with two different access structures.
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This section contains two parts. The first part presents the basic concepts related to VCS. The second part reviews some previous results of graph access structure VCS.

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