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Method and device for protecting products against counterfeiting

  • US 9,317,981 B2
  • Filed: 01/22/2008
  • Issued: 04/19/2016
  • Est. Priority Date: 01/19/2007
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a request to access a first unique identifier stored in a shadow memory area of a transponder, read access to the first identifier being based on a state of a flag and on knowledge of secret shadow memory access information, the transponder having a second unique identifier stored in a second memory area;

    requiring authentication prior to permitting read access to the first identifier in response to the state of the flag having a first value; and

    permitting read access to the first identifier when the request includes the secret shadow memory access information.

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