Steganographic system

  • US 5,850,481 A
  • Filed: 05/08/1995
  • Issued: 12/15/1998
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A paper medium having steganographically encoded data stored therein, the steganographically encoded data being produced in accordance with the following method:

  • providing first and second signals;

    modulating the first signal with the second to produce a third signal, wherein the second signal cannot be discerned from the third signal without the first signal;

    shaping the surface micro-topology of the paper medium in accordance with the third signal.

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