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System and method for securing RF transactions using a radio frequency identification device including a random number generator

  • US 7,925,535 B2
  • Filed: 03/10/2004
  • Issued: 04/12/2011
  • Est. Priority Date: 07/10/2001
  • Status: Expired due to Fees
First Claim
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1. A system for securing a radio frequency (RF) transaction, the system comprising:

  • a radio frequency identification (RFID) transaction device operable to send an RF transmission, the transaction device including;

    a database for storing a transaction device identifier and a transaction device authentication tag, wherein the transaction device identifier is different from the transaction device authentication tag,a transaction device random number generator for generating a transaction device random number, the transaction device random number generator being located at the transaction device, anda transmitter operable to transmit the transaction device identifier, the transaction device authentication tag, and the transaction device random number;

    wherein the transaction device is operable for transmitting, to a RFID reader, both the transaction device identifier and the transaction device authentication tag for validation, wherein the validation is based at least in part on both the transaction device identifier and the transaction device authentication tag; and

    wherein the transaction device random number is used to lookup a previously stored decryption key for decrypting at least one of the transaction device identifier and the transaction device authentication tag, the transaction device random number having been received from the RFID transaction device.

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