Doddington's Zoo and Fingerprint System Security - Noblis

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Applying the “Zoo” to System Design – If the ‘zoo’ concept really applies to fingerprints, then the ROC curves for various subpopulations are not identical. For example, some hypothetical algorithm may perform as shown below. W/L Sheep and Goats – 90% of population FNMR = 0.001 at FMR of 0.000001 Wolves and Lambs – 10% FNMR=0.2 at FMR of 0.001 This Presentation is BearingPoint Proprietary Information © 2007 BearingPoint, LLC. 9
Applying the “Zoo” to System Design If Sheep/Goat and Wolf/Lamb subpopulations are disjoint and subpopulation membership can be determined at time of credential issuance, it can be recorded on the credential and used to establish a variable matching threshold. ─ Credentials marked as Sheep or Goat would have lower matching threshold ─ Credentials marked as Wolf/Lamb would have higher matching threshold ─ Credentials marked as ‘Indeterminate’ would have higher matching threshold This approach produces a lower system FNMR at a given FMR. FMR System = + N S/G * FMR N S/G S/G + N + N This Presentation is BearingPoint Proprietary Information © 2007 BearingPoint, LLC. W/L W/L * FMR W / L 10
Page 1 and 2: Doddington's Zoo and Fingerprint Sy
Page 3 and 4: Overview - MINEX04 results imply lo
Page 5 and 6: What does FMR really tell us? FMR r
Page 7 and 8: Doddington’s Zoo - Doddington, et
Page 9: Zoo Population Sizes - What percent
Page 13 and 14: Analysis of NIST IAD Biometric Scor
Page 15 and 16: Score Frequencies Frequency 2000000
Page 17 and 18: Lamb & Wolf Analysis Rather than FN
Page 19 and 20: Application of higher thresholds On
Page 21 and 22: Impact on Overall System FMR All ma
Page 23 and 24: Caveats - Parameter selections were
Page 25 and 26: Next Steps - Acquire dataset that l
Page 27: This Presentation is BearingPoint P

Doddington's Zoo and Fingerprint System Security - Noblis

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