All reports by Author Hans Ulrich Simon:

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TR00-003
| 26th November 1999
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Matthias Krause, Hans Ulrich Simon#### Determining the Optimal Contrast for Secret Sharing Schemes in Visual Cryptography

Matthias Krause, Hans Ulrich Simon

This paper shows that the largest possible contrast C(k,n)

in a k-out-of-n secret sharing scheme is approximately

4^(-(k-1)). More precisely, we show that

4^(-(k-1)) <= C_{k,n} <= 4^(-(k-1))}n^k/(n(n-1)...(n-(k-1))).

This implies that the largest possible contrast equals

4^(-(k-1)) in the limit when n approaches ...
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