HP iPAQ h5400 Series White Paper page 6

biometric security with the iPAQ Pocket PC h5400 series
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. . a u t h e n t i c a t i o n s o f t w a r e s e c u r i t y l e v e l s
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The biometric software called BioSwipe is based on capabilities developed by Cogent for use in
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criminal Automatic Fingerprint Identification Systems that require highly accurate capabilities for
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performing 1-to-many searches of very large databases. The Cogent algorithms analytically model
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natural irregularities that define uniqueness in fingerprints, providing the scientific foundation for
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establishing positive identification. BioSwipe adapts the Cogent algorithms to the one-to-few
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verification requirements of the iPAQ Pocket PC. In establishing authentication, the biometric
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software can be set up to operate in three security level environments: Regular, High, and Extra
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. . High. These security levels are based on expected false rejection rates (FRR), false acceptance
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rates (FAR), and enrollment strategies (see the table that follows). As the security level rises, so
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. . does the intensity of the parameters that are used for enrolling a fingerprint and for achieving a
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match.
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A false acceptance is achieved when sample and reference templates produce a numerical score
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that meets the pre-established threshold for acceptance, even though the images are not from the
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same fingerprint. A false rejection results when an enrolled person does not achieve an acceptable
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score when the sample and reference templates are compared. In establishing the different security
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levels, there is an inverse relationship between the FAR and FRR. When the security level rises,
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FAR decreases while FRR increases. In determining the best level, generally you would want to
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decrease the FAR based on likelihood of security breaches and database size. In the case of your
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iPAQ Pocket PC h5400 Series, the default security level is Regular as the device is for personal
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use and the threat of a security infringement is low.
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The following table shows the iPAQ Pocket PC FRR and FAR performance test results for the
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various security levels.
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Security Level
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. . Regular
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High
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Extra High
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5981-4266EN
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FRR
0.2331 % (1 out of 429)
0.4662 % (2 out of 429)
0.6993 % (3 out of 429)
FAR Average number of
attempts
0.0010 % (41 out of 1.081967
4054737)
0.0001 % (4 out of 1.107573
4054737)
0.0000 % (0 out of 1.153226
4054737)