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Covert authentication method and apparatus

  • US 20050239207A1
  • Filed: 04/22/2004
  • Published: 10/27/2005
  • Est. Priority Date: 04/22/2004
  • Status: Active Grant
First Claim
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1. An authentication method comprising the steps of:

  • a. tagging an item by randomly distributing a taggant in at least part of the item, the taggant being invisible to an unaided human eye under normal conditions;

    b. optically detecting said taggant by i. placing a detector in proximity to the item and ii. generating data related to the taggant distribution; and

    c. verifying whether the data matches previous data from previously detected items.

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