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Ecaterina Moraru (Valica)
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Visual Cryptography
1.
Visual Cryptography (OR)
Reading Between the Lines Ecaterina Valică http://students.info.uaic.ro/~evalica/
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Stacking Model: Stacking
& Contrast m m : V H(V) H(V) m B H(V) m W m W < m B contrast = (m B -m W )/m
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Model
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2 out of
2 Scheme (2 subpixels)
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Horizontal shares Vertical
shares Diagonal shares 2 out of 2 Scheme (4 subpixels)
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2 out of
2 Scheme (4 subpixels)
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share1 share2 stack
pixel random 0 1 2 3 4 5 0 1 2 3 4 5 4 1 0 5
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3 out of
3 Scheme (4 subpixels) Original Share #1 Share #2 Share #3 Share #1+#2+#3 Share #1+#2 Share #2+#3 Share #1+ #3
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2 out of
6 Scheme Share#1 Share#2 Share#3 Share#4 Share#5 Share#6 2 shares 3 shares 4 shares 5 shares 6 shares
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Extensions -
Color VC
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