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I am new to visual cryptography. I’ve just read the paper “Visual Cryptography” by Moni Naor and Adi Shamir and I'm stuck on the chapter about the “$k$ out of $n$” construction. I am aware that, on page 8, there is a step-by-step explanation on how to construct it… but I still do not understand how it works.

Specifically:

  • At function $h$ (number 1) – How does one get that function?
  • Also, related to the notation $S^b_t$ – can someone explain what that $t$ stands for?

Any help is appreciated, but I guess it would probably be best if someone could give me a somewhat simple example that shows how to construct a “$k$ out of $n$” visual cryptography scheme.

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