Shaping classification boundaries in template protection systems
First Claim
1. An authentication apparatus for authentication of a physical object comprisingan enrollment means (ENRL), andan authentication means (AUTH), whereinsaid enrollment means are arranged inmeasuring reference characteristics of said physical object;
- generating and storing template data based on said measured reference characteristics;
generating and storing a helper data (W1) based on said template datagenerating and storing a control value (V1);
the authentication means being arranged in;
obtaining a metric (Y) from the physical object to be authenticated;
and further comprising;
a first generation means (GM1) arranged to generate a first property set (C1) using the helper data (W1) and the metric (Y) obtained from the physical object,a second generation means (GM2) arranged to subject said first property data set (C1) to a noise compensating mapping (NCM) to compensate for measured noise in said metric (Y) thereby generating a second property set (S1),a comparing means (CMP) arranged to establish a sufficient match between the physical object and the reference object, by verifying whether the second property set (S1) is within a classification boundary (REG1) of the reference object using the first control value (V1) and wherein a noise robust mapping (NRM) determines the classification boundary,the authentication apparatus characterized in that it further comprises;
a third generation means (GM3) arranged to generate an error measure (ERR) by quantifying the noise removed by the noise compensating mapping (NCM) using the first property set (C1) and the second property set (S2), andan authentication decision means (ADM) arranged to use said error measure (ERR) to generate an authentication decision (D).
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Accused Products
Abstract
The invention relates to a method of authentication of a physical object and an apparatus applying said method. The method uses a helper data (W1) and a control value (V1) associated with a reference object to generate a first property set (C1) using the helper data (W1) and a metric (Y) associated with the physical object. It further comprises a step to generate a second property set (S1) using a noise compensating mapping (NCM) on the first property set (C1), as well as a step to establish a sufficient match between the physical object and the reference object using the second property set (S1) and the first control value (V1). The method is characterized by a step that generates an error measure (ERR) by quantifying the noise removed by the noise compensating mapping (NCM) using the first property set (C1) and information derived from the noise compensating mapping (NCM). Error measure (ERR) is subsequently used for generating an authentication decision (D). Also provided is an apparatus configured to carry out the method.
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Citations
20 Claims
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1. An authentication apparatus for authentication of a physical object comprising
an enrollment means (ENRL), and an authentication means (AUTH), wherein said enrollment means are arranged in measuring reference characteristics of said physical object; -
generating and storing template data based on said measured reference characteristics; generating and storing a helper data (W1) based on said template data generating and storing a control value (V1); the authentication means being arranged in; obtaining a metric (Y) from the physical object to be authenticated; and further comprising; a first generation means (GM1) arranged to generate a first property set (C1) using the helper data (W1) and the metric (Y) obtained from the physical object, a second generation means (GM2) arranged to subject said first property data set (C1) to a noise compensating mapping (NCM) to compensate for measured noise in said metric (Y) thereby generating a second property set (S1), a comparing means (CMP) arranged to establish a sufficient match between the physical object and the reference object, by verifying whether the second property set (S1) is within a classification boundary (REG1) of the reference object using the first control value (V1) and wherein a noise robust mapping (NRM) determines the classification boundary, the authentication apparatus characterized in that it further comprises; a third generation means (GM3) arranged to generate an error measure (ERR) by quantifying the noise removed by the noise compensating mapping (NCM) using the first property set (C1) and the second property set (S2), and an authentication decision means (ADM) arranged to use said error measure (ERR) to generate an authentication decision (D). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer controlled method suitable of authentication of a physical object in a system employing template data protection,
comprising an enrollment process consisting of the steps of: -
measuring reference characteristics of the physical object; generating template data based on said measured reference characteristics; generating a helper data (W1) based on said template data generating a control value (V1); the method further including an authentication process consisting of the steps of obtaining a metric (Y) from the physical object to be authenticated; generating a first property data set (C1) based on the helper data (W1) and the metric (Y), subjecting said first property data set (C1) to a noise compensating mapping (NCM) to compensate for measured noise in said metric (Y) thereby; generating a second property data set (S1), for authenticating purposes of the physical object verifying whether the second property data set (S1) is within a classification boundary (REG1) of the reference object using the first control value (V1) and wherein a noise robust mapping (NRM) determines the classification boundary, the method characterized in that it further comprises the following steps; generating an error measure (ERR) by quantifying the noise measured in said metric (Y) by the noise compensating mapping (NCM) using the first property set (C1) and the second property set (S2), and generating an authentication decision (D) using said error measure (ERR). - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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8. A computer controlled method as claimed in 7, where the step for generating the error measure (ERR) comprises quantifying the difference between the first property set (C1) and the second property set (S1).
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9. A computer controlled method as claimed in 7, where the step for generating the error measure (ERR) comprises a step that:
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generates a third property set (C2) using the noise robust mapping (NRM) on information comprising the second property set (S1), generates the error measure (ERR) by quantifying the difference between the first property set (C1) and the third property set (C2).
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19. A computer controlled method as claimed in 18, where said probability measure (P) is used to establish the identity of said physical object.
Specification