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Challenged-based tag authentication medel

  • US 20040066278A1
  • Filed: 10/04/2002
  • Published: 04/08/2004
  • Est. Priority Date: 10/04/2002
  • Status: Active Grant
First Claim
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1. A method of securing communications in an RFID system including a reader and an RF tag having a memory configured to store information, the method comprising:

  • sending, from the reader, a message to the tag;

    the tag, in response to the message, generating a challenge value and sending the challenge value to the reader;

    in any order;

    the reader performing a mathematical operation on the challenge value based upon a key value to generate a challenge reply and sending the challenge reply to the tag; and

    the tag independently computing a challenge response based on the key value and mathematical operation;

    the tag comparing the challenge response computed by the tag with the challenge reply send by the reader; and

    the tag authenticating the reader if the challenge response matches the challenge reply.

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