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Securing a transaction between a transponder and a reader

  • US 8,872,619 B2
  • Filed: 05/03/2007
  • Issued: 10/28/2014
  • Est. Priority Date: 07/10/2001
  • Status: Expired due to Fees
First Claim
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1. A transponder device, comprising:

  • encryption circuitry configured to;

    encrypt, with a transponder device authentication key, a transponder device authentication signal received from a reader to create an encrypted transponder device authentication signal,encrypt an account code with an account code key to create an encrypted account code, anddecrypt, with a reader authentication key, an encrypted reader authentication signal received from the reader to create a decrypted reader authentication signal;

    a protocol/sequence controller configured to;

    transmit the encrypted transponder device authentication signal to the reader, andtransmit the encrypted account code to the reader to facilitate a payment transaction responsive to the decrypted reader authentication signal matching a reader authentication signal; and

    authentication circuitry configured for mutual two-way authentication with the reader via the transponder device authentication signal and the reader authentication signal, including authenticating the reader responsive to the decrypted reader authentication signal matching the reader authentication signal transmitted from the transponder device to the reader.

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