On the Analysis and Generalization of Extended Visual Cryptography Schemes

Details On the Analysis and Generalization of Extended Visual Cryptography Schemes On the Analysis and Generalization of Extended Visual Cryptography Schemes

2006-10-31

arxiv.org/abs/cs/0610172v1

Computer Science

Cryptography and Security

Scientific paper

An Extended Visual Cryptography Scheme (EVCS) was proposed by Ateniese et al. [3] to protect a binary secret image with meaningful (innocent-looking) shares. This is implemented by concatenating an extended matrix to each basis matrix. The minimum size of the extended matrix was obtained from a hypergraph coloring model and the scheme was designed for binary images only [3]. In this paper, we give a more concise derivation for this matrix extension for color images. Furthermore, we present a (k, n) scheme to protect multiple color images with meaningful shares. This scheme is an extension of the (n, n) VCS for multiple binary images proposed in Droste scheme [2].

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