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RFID tag authentication with public-key cryptography

  • US 8,941,469 B1
  • Filed: 06/07/2011
  • Issued: 01/27/2015
  • Est. Priority Date: 06/14/2010
  • Status: Active Grant
First Claim
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1. A method for a Radio Frequency Identification (RFID) reader to authenticate an RFID tag, the method comprising:

  • retrieving a tag public key (TPK), an item identifier (II), and an electronic signature (ES) from the tag, the ES computed over at least the TPK and the II;

    retrieving a signing-authority public key (SAPK) associated with the ES from a signing authority;

    verifying, using the SAPK and the ES, the TPK and the II;

    challenging the tag with a challenge;

    receiving a response from the tag; and

    authenticating the tag by verifying the response using the TPK.

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