a journey through biometrics julian ashbourn bcs nov 17 th 2010
TRANSCRIPT
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A Journey Through Biometrics
Julian Ashbourn
BCS Nov 17th 2010
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Julian Ashbourn ~ Slide 2
The Beginning
Did ancient civilisations use biometrics? “Nechutes, son of Asos, aged forty, of middle size,
sallow complexion, cheerful countenance, long face with straight nose and a scar upon the middle of his forehead…”
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Julian Ashbourn ~ Slide 3
Afterwards
Alphonse Bertillon 1853-1914 A fascination with anatomical
measurement within the context of criminology
Bertillon developed a complex system of measurements and photography which came to be widely used ~ Anthropometry
A pioneer of the criminal mug-shot
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Julian Ashbourn ~ Slide 4
The Fascination Continues
Francis Galton 1822-1911 Explorer, anthropologist,
cousin of Charles Darwin, developed the concept of eugenics
Amassed over 8000 sets of fingerprints and developed a classification system based upon minutiae
Placed the study of fingerprints on a sound scientific basis
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Julian Ashbourn ~ Slide 5
And Evolves
Juan Vucetich 1858-1925 Developed a system of fingerprint
classification based upon Galton’s ideas, for the Argentine police
First positive identification by fingerprints in a criminal case (Francisca Rojas)
System widely adopted by police forces in many countries
Galton-Henry system adopted by Scotland Yard
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Julian Ashbourn ~ Slide 6
Biometrics in Passports?
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Julian Ashbourn ~ Slide 7
Interim Conclusion
The idea of using a biometric for identity verification purposes is hardly new
What has changed is the prospect of automation within the information age
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Julian Ashbourn ~ Slide 8
Modern Principles of Operation
How does it all work? Determine features to be matched Extract features and create biometric reference Extract features from live sample and match
against reference creating a ‘statement of likeness’ Determine a match or non-match according to the
alignment of the statement of likeness against a pre-defined threshold
Thresholds may be adjustable in order to manipulate realised performance
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Julian Ashbourn ~ Slide 9
In Simple Terms
Registration Live Operation
011%0$11%100$0%1%0011%0$11%100$0%1%0
Capture Sample
Extract Features
Create Reference
Biometric Code
Store Reference
011%0$11%100$0%1%0011%0$11%100$0%1%0
010%0$10%100$0%1%0010%0$10%100$0%1%0
ScoreScore 85 85ThresholdThreshold 80 80
ResultResult Match Match
Capture Sample
Extract Features & Create Code
Retrieve Stored Code & Compare
Generate Likeness Score
Align with
Threshold
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Julian Ashbourn ~ Slide 10
Probability of Errors
0
1
2
3
4
5
6
10 20 30 40 50 60 70 80 90 100
False Match
False Non-Match
Equal Error
Rate
Definable Threshold
Error
Rate
%
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Julian Ashbourn ~ Slide 11
Environmental Factors
Operational environment Temperature, humidity, available light, noise
levels, cleanliness, signage
Technical environment Network availability, noise, power stability,
component performance
User psychology Habituated or non-habituated user, sympathetic or
not to concept, disabilities, confidence, general understanding of technology
Which of these factors has anWhich of these factors has an
effect upon realised performance?effect upon realised performance?
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Julian Ashbourn ~ Slide 12
Real Performance
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Julian Ashbourn ~ Slide 13
Real Performance
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Julian Ashbourn ~ Slide 14
Equivalence of Performance
6767 8282 5959 8787
Who installed the system? Who set the threshold? Against what criteria? Who is maintaining the system? How often is it checked?
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Julian Ashbourn ~ Slide 15
Maintaining Equivalence
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Julian Ashbourn ~ Slide 16
Interim Conclusion
Biometric matching is not an exact science
System implementation may be complex
Understanding performance is important
True systems integration is potentially complex
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Julian Ashbourn ~ Slide 17
Societal Implications
Some fundamentals Under what situations might it be pertinent to
undertake a biometric identity verification check? Who does the biometric belong to? Who should decide how it is used? Who has access to data aligned with a biometric? Can a biometric match be repudiated? Should a biometric be used covertly? What assumptions are made around the results of a
biometric identity verification transaction?
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Julian Ashbourn ~ Slide 18
Information Alignment
How accurate is the information associated with a particular biometric
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Julian Ashbourn ~ Slide 19
Information Utilisation
Service provision or imposition?
Who is working for who?
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Julian Ashbourn ~ Slide 20
A Brave New World
William Shakespeare O wonder! How many goodly creatures are there here! How beauteous mankind is! O brave new world!
Or….
Aldus Huxley George Orwell H.G. Wells
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Julian Ashbourn ~ Slide 21
Where is This Leading?
What legacy shall we leave for future generations?
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Julian Ashbourn ~ Slide 22
A New Rising Sun
The time has come to take a fresh look at what we might achieve with this technology A biometric users charter A re-statement of relevance Best practices around systems integration Clarity around privacy, ownership and data
protection Clarity of purpose with respect to public sector
applications Clarity of communication
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Julian Ashbourn ~ Slide 23
Credo Congregatio
A possible mechanism with which to establish a related centre of excellence
There is much existing work which could potentially feed into this concept
Next steps…
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Julian Ashbourn ~ Slide 24
Specialissimus Terrigenus