UPDATING OF REFERENCE MAGNETIC SIGNATURE FOR AUTHENTICATING A DOCUMENT WITH A MAGNETIC STRIPE
First Claim
1. A method for authenticating a document that includes a magnetic stripe having a distinct magnetic characteristic, wherein the magnetic characteristic exists over one or more predetermined segments of the magnetic stripe, the method comprising:
- receiving, at an authentication device, a set of values representing the magnetic characteristic;
comparing the received values to reference values, wherein comparing includes;
determining an error for each received value, wherein each error includes a sum of contributions, each corresponding to a different set of previously received values representing the magnetic characteristic; and
based on the comparison, providing a measure of an authenticity of the document.
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Accused Products
Abstract
Methods, systems, and apparatus for accurately authenticating a document (e.g. a credit card) having a magnetic stripe are provided. The magnetic field at different points of the magnetic stripe are measured, e.g., by a checkout scanner to create a magnetic signature. Digital samples of the measurements may be used to create a representation of the magnetic signature. The representation can then be compared to reference values to produce a measure of the authenticity of the document. The reference values are updated over time to reflect changes in the magnetic stripe of the authentic document, as may occur due to physical deterioration. For example, reference values may be optimized based on recent measurements of the authenticated document to provide a more accurate determination of authenticity for future measurements.
28 Citations
21 Claims
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1. A method for authenticating a document that includes a magnetic stripe having a distinct magnetic characteristic, wherein the magnetic characteristic exists over one or more predetermined segments of the magnetic stripe, the method comprising:
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receiving, at an authentication device, a set of values representing the magnetic characteristic; comparing the received values to reference values, wherein comparing includes; determining an error for each received value, wherein each error includes a sum of contributions, each corresponding to a different set of previously received values representing the magnetic characteristic; and based on the comparison, providing a measure of an authenticity of the document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computer program product comprising a computer readable medium encoded with a plurality of instructions for controlling a computing system to perform a method for authenticating a document that includes a magnetic stripe having a distinct magnetic characteristic, wherein the magnetic characteristic occurs over one or more predetermined segments of the magnetic stripe, the instructions comprising:
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receiving a set of values representing the magnetic characteristic; comparing the received values to reference values, wherein comparing includes; determining an error for each received value, wherein each error includes a sum of contributions, each corresponding to a different set of previously received values representing the magnetic characteristic; and based on the comparison, providing a measure of an authenticity of the document. - View Dependent Claims (13, 14, 15, 16)
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17. A system for authenticating a document that includes a magnetic stripe having a distinct magnetic characteristic, wherein the magnetic characteristic occurs over one or more predetermined segments of the magnetic stripe, the system comprising:
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an input for receiving a set of values representing the magnetic characteristic; a processor communicably coupled with the input, the processor configured to; compare the received values to reference values, wherein the comparing includes; determining an error for each received value, wherein each error includes a sum of contributions, each corresponding to a different set of previously received values; and based on the comparison, providing a measure of an authenticity of the document. - View Dependent Claims (18, 19, 20, 21)
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Specification