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Dynamic primary account number (PAN) and unique key per card

  • US 10,037,524 B2
  • Filed: 01/22/2009
  • Issued: 07/31/2018
  • Est. Priority Date: 01/22/2009
  • Status: Expired due to Fees
First Claim
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1. A method of processing a financial transaction by a user and related to a financial account having a real Primary Account Number (PAN), the method comprising:

  • detecting, with a processor, initiation of the transaction with a device used as a presentation instrument in the transaction;

    generating, with the processor, a Dynamic Transaction Cryptogram (DTC) at the device that is valid for a single transaction, the DTC encrypted at the device using a card key and based on personal information that is known to the user and that identifies the user;

    generating, with the processor, a dynamic PAN at the device, the dynamic PAN comprising an encrypted form of the real PAN that is valid for the single transaction; and

    providing both the DTC and the dynamic PAN from the device to a Point-of-Sale (POS) device for use in the transaction, wherein the provided dynamic PAN is decrypted in order to determine the real PAN for processing of the transaction, wherein the real PAN that is determined from the provided dynamic PAN is then used to retrieve a key corresponding to the card key, and wherein the DTC is provided in order to authenticate the transaction, using the retrieved key.

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