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Contact-less tag with signature, and applications thereof

  • US 20090160615A1
  • Filed: 12/11/2008
  • Published: 06/25/2009
  • Est. Priority Date: 12/20/2007
  • Status: Abandoned Application
First Claim
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1. A method, comprising:

  • generating a first signature by encoding an identifier with a first additional data set at a first time instant;

    responding to a first read request from a tag reader by releasing the first signature;

    generating a second signature by encoding the identifier with a second additional data set at a second time instant, the second additional data set being different from the first additional data set; and

    responding to a second read request by releasing the second signature.

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