Welcome to the resource topic for 2004/287
Title:
Almost Ideal Contrast Visual Cryptography with Reversing
Authors: Duong Quang Viet, Kaoru Kurosawa
Abstract:A drawback of visual cryptography schemes (VCS) is much loss of contrast in the reconstructed image. This paper shows a new paradigm of VCS in which the original image is almost perfectly reconstructed. A very simple non-cryptographic operation is assumed, reversing black and white, which many copy machines have these days. We first show a (k,n)-VCS with {\it reversing} such that white pixels are almost perfectly reconstructed in addition to the perfect reconstruction of black pixels. The proposed scheme is fully compatible with traditional VCS in the following sense: Even if we do not have a copy machine as described above, we can reconstruct the secret image I exactly in the same way as in
the underlying VCS. In other words, we use a copy machine as a hedge to obtain better contrast.
We next show how to convert a perfect {\it black} (k,n)-VCS (with reversing) into a perfect {\it white} (k,n)-VCS with reversing. Thirdly, we show a perfect black VCS for any monotone access structure. Finally, we show applications of our idea to colored VCS and grey level VCS, respectively.
ePrint: https://eprint.iacr.org/2004/287
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