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Algorithm for RFID security

  • US 7,372,364 B2
  • Filed: 11/10/2003
  • Issued: 05/13/2008
  • Est. Priority Date: 11/10/2003
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • selectively interrogating radio frequency identification tags in an interrogation corridor such that only those tags having a selected value in a specified memory location respond to the interrogation;

    simultaneously receiving a response from all of the radio frequency identification tags having the selected value in the specified memory location;

    detecting at least one radio frequency identification tag having the selected value in the specified memory location in the interrogation corridor if only a valid partial response is received; and

    indicating an alarm upon receiving only the valid partial response from at least one of the radio frequency identification tags having the selected value.

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