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Method and system using candidate dynamic data elements

  • US 9,940,621 B2
  • Filed: 06/17/2013
  • Issued: 04/10/2018
  • Est. Priority Date: 11/16/2006
  • Status: Active Grant
First Claim
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1. A method for conducting a transaction, comprising:

  • generating, by a portable consumer device, a verification value in response to a transaction involving an access device;

    sending, by the portable consumer device, the verification value and a portion of a first dynamic data element to the access device, the portion of the first dynamic data element including data included in a fixed position of the first dynamic data element, the verification value being different from the portion of the first dynamic data element; and

    communicating, by the access device, the verification value and the portion of the first dynamic data element to a service provider computer;

    wherein the service provider computer determines a plurality of candidate dynamic data elements using the portion of the first dynamic data element in response to determining that the verification value does not match a second verification value independently generated by the service provider computer, determines a plurality of candidate verification values from the plurality of candidate dynamic data elements, and determines whether the verification value matches any of the plurality of candidate verification values;

    wherein, each of the plurality of candidate verification values is unique to a corresponding candidate dynamic data element of the plurality of candidate dynamic data elements; and

    wherein the transaction is thereafter authenticated when the verification value matches any of the plurality of candidate verification values.

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