joshua grieser. general definition ◦ biometrics is the science and technology of measuring and...
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BiometricsJoshua Grieser
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General Definition◦ Biometrics is the science and technology of
measuring and analyzing biological data IT Definition
◦ Refers to technologies and methods for uniquely recognizing humans based upon at least one physical or behavioral trait
Instead of using something you have (a key) or something you know (a password), biometrics uses who you are to identify you
Introduction
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Quantitative measurements of humans for the purpose of identification dates back to 1870s◦ Measurement system of Alphonse Bertillon
System included skull diameter and arm and foot length measurements
1920s: used to identify prisoners 1960s: digital signal processing techniques
lead to automating human identification 1970s: government using technologies for
fingerprint and hand geometry
History of Biometrics
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Two categories of biometric identifiers◦ Anatomical◦ Behavioral
Different types of biometric systems How it works Enrollment process Uses of biometric systems
◦ Current◦ Future
Overview
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Fingerprint Face recognition Iris recognition Palm print
Common Types
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DNA Voice patterns Handwriting Keystroke dynamics Skin analysis Vein patterns Gait
Other Types
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Token – something a person possesses and uses to assert a claim to identity◦ (Password, PIN)
Tokens no longer sufficient to authenticate identity◦ Easy to counterfeit/steal◦ Cannot ensure positive identification of a person◦ Passwords forgotten and stolen
Biometric identifiers are linked to a person More robust audit trail, documentation
Why Use Biometrics?
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Large number of civilian and government applications
Physical access control Welfare disbursement International border crossing National ID cards Computer log-in Safes Home alarm systems
Current Applications
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Seven factors used:◦ Universality◦ Uniqueness◦ Permanence◦ Measurability◦ Performance◦ Acceptability◦ Circumvention
Note: No single biometric will meet all requirements of every possible application.
Assessing suitability of a trait
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Universality◦ Means that every person using a system should
possess the trait. Uniqueness
◦ Means the trait should be sufficiently different for each person using the system in order to distinguish from one another.
Permanence◦ Relates to a trait varying over time. Trait with
good permanence will be more invariant over time, not constantly changing.
Seven Factors
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Measurability (collectability)◦ Relates to the ease of measuring the trait. The data
form can be processed, features extracted. Performance
◦ Relates to accuracy, speed and robustness of the technology used.
Acceptability◦ Relates to how well individuals in the population
accept the technology. They are willing to have that biometric trait captured and assessed.
Circumvention◦ Relates to the how easy the trait is to imitate.
Seven Factors
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All systems boil down to the same three steps
Enrollment◦ Records information about you
Storage◦ Translates the info into a code or graph
Comparison◦ Compares traits to the template on file
How it works
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All systems also use the same three components
Sensor◦ Detects characteristic being used for identification
Computer◦ Reads and stores the information
Software◦ Performs actual comparison
How it works
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In general, biometric system will scan trait and process data by accessing a database.
Two modes◦ Verification mode◦ Identification mode
Biometric templates◦ Most biometric types are converted into
mathematical representations to compare against
How it works
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Stored in reader device, central repository, or portable token
Some devices have temporary storage
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System performs one-to-one comparison Uses specific template stored in a database Involves confirming or denying a person’s
claimed identity Am I who I claim I am? To determine which template to compare
against, one of the following is used:◦ Smart card◦ Username◦ ID number
Verification Mode
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System performs one-to-many comparison◦ More difficult
Attempts to recognize a person from a list of users in the template database
Who am I? Successfully identifies the human if the
sample collected matches template from the database when compared
Comparison result has to fall into preset threshold
Identification Mode
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Enrollment - first time an individual uses the biometric system
During enrollment, biometric information from individual is captured and stored in the database
In subsequent uses, the sample is collected and compared with the information stored at the time of enrollment
Three Blocks
Enrollment
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Interface between system and real world (human)
Where the system acquires all necessary data
Actual interaction with sensors Mainly image acquisition systems Can be different depending on desired
characteristics
First Block
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All pre-processing performed Removes artifacts from sensors to enhance
input Normalization Example: removing background noise
Second Block
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Necessary, unique features are extracted to create the template
Critical step, correct features have to be extracted in the optimal way
Uses vector of numbers or an image with particular properties to create template
Discards measurements not used in creation of template◦ Reduce file size◦ Protect identity of enrollee
Third Block
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Encrypted using strong cryptographic algorithms to secure and protect them from disclosure
Protects biometric templates from being◦ Reconstructed◦ Decrypted◦ Reverse-engineered◦ Manipulated in other ways
Most templates are site specific Data is converted into code, not real life
representation of person’s traits
Templates are safe
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When performing matching phase, template is passed to matcher that compares it with existing templates
Estimates distance between them using comparing algorithm ◦ (how different the two templates are)
Many different algorithms depending on biometric type◦ Example: Hamming distance
If accepted, it is output for specified use like entrance in a restricted area
Comparing Algorithms
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“distance” between two strings of equal length (how different they are)
Measures minimum number of substitutions required to change one string into the other string (number of errors)
Examples◦ “toned” “roses” = 3◦ 1011101 1001001 = 2◦ 2173896 2233796 = 3
Programmed in many different languages Used for strings, integers, characters
Hamming Distance
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Oldest biometric known Were previously captured with ink on paper
and mailed/faxed Entire process now done in near real time Leading toward use in applications from
biometric passports to ATMs Ridges and furrows used as reference points 60-70 points of reference in fingerprints
Fingerprint
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Fingerprint
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Face we are born with remains identifiable throughout our lives
Curves and contours remain relatively stable
Requires large image capture device Most suitable at fixed locations Least intrusive, can be scanned from a
distance Accuracy depends on lighting conditions
Face Recognition
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Face Recognition
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Each iris has different shapes and colors As unique as a snowflake Less intrusive, scanners don’t require bright
lights Mathematical expression of iris is most
detailed of any biometric technology Most accurate biometric Considered one of the most secure
Iris Recognition
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Approximately 250 distinctive characteristics in an iris
All can be used as points of reference for comparison
Odds of two people having the same pattern are 1 in 7 billion
Comparing against database is quick and high level of accuracy
Used in airports and other secure facilities Most costly system
Iris Recognition
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Iris Recognition
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Size and shape of hands are unique to individuals
Device scans 3-D geometry of hand and fingers
Creates mathematical picture which is compared against a database
Readers are large, best suited for fixed point access
Capture units withstand extreme workforce conditions like temperature, weather
Can also verify individual’s hand even when it is dirty
Palm Print
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Palm Print/Hand Geometry
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Password for voice is tone and timbre Graph representation and compared against
a database User has to teach the computer first by
speaking a number of phrases Quick and efficient after the enrollment
process Only ambient noise limits its application
Voice Recognition
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Not just how you shape each letter Analyzes act of writing Examines pressure you use, speed and
rhythm with which you write Records sequence in which you form letters
◦ Add dots and crosses as you go or after you finish Systems sensors can include touch-
sensitive writing surface or pen that contains sensors and detects angle, pressure, and direction
Translates handwriting into a graph
Handwriting Recognition
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Handwriting Recognition
PressureSpeedAccelerationAngle
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Aim to auto-update templates Benefits:
◦ No longer need to collect large number of biometric samples during enrollment process
◦ No longer necessary to re-enroll/retrain the system
◦ Can significantly reduce the cost of maintaining a biometric system
Issues:◦ Higher false acceptance◦ Threshold has to account for a changing template
Adaptive Biometric Systems
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Privacy and discrimination◦ Possible to use data from enrollment for ways in
which the user did not consent◦ Example: DNA recognition used to screen for
genetic diseases Higher danger to owners
◦ Thieves can get more desperate◦ Example: cut off a finger to get access to
fingerprint scanner Cancelable biometrics
◦ Unlike passwords, biometrics cannot be cancelled or reissued to a person if compromised
Issues and Concerns
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Some people object to biometrics for cultural or religious reasons
Possibility of companies selling biometric data similar to email addresses/phone numbers
Over reliance – not foolproof, can’t forget about common sense security practices
Accessibility – some systems can’t be adapted for all populations (elderly/disabled people)
Issues and Concerns
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Australia Brazil Canada Germany India Iraq Italy United States
Used in Many Countries
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International sharing of biometric data◦ Countries, including US, are sharing biometric
data with other nations◦ Positive:
Could help combat terrorism by having access to other countries’ data
◦ Negative: Easier for people in other countries to get access to
our data Makes it easier to tamper with
International Issue
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Minority Report◦ Uses Iris scans for identification as well as POS
transactions MythBusters
◦ Attempted to break into commercial security door◦ Had fingerprint authentication◦ Successful with printed scan of fingerprint◦ Unsuccessful with gel fingerprint
Mission Impossible◦ Voice/iris recognition
Popular Culture
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Biometrics Vulnerability Assessment Service Proprietary of Biometrics Institute Customer submits their system for
independent testing Conducted in an independent laboratory Biometric devices are sent to have their
vulnerabilities investigated, assessed, and reported
Helps make sure your system is secure and work out any kinks
BVAS
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Central source of info on biometrics-related activities of the federal government
Sister site www.biometrics.org Repository of public information and
opportunities for discussion Developed to encourage collaboration and
sharing of info on biometric activities among:◦ Government departments and agencies◦ State, regional, and international organizations◦ General public
Biometrics.gov
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Biometrics Reference◦ General info about biometric technologies,
government programs and privacy planning Presidential Directives
◦ PD that touch on biometrics or federal biometric activities
NSTC Subcommittee on Biometrics and Identity Management Room◦ Info on the National Science & Technology Council’s
Subcommittee on Biometrics Standards
◦ Info on federal biometric standards policy
Four main rooms
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Hospitals using scan of veins in your hand to identify patients◦ Easy access to medical records◦ Eliminates paper records
Germany, supermarkets use fingerprint biometrics to identify consumer account information and make payments◦ Possible use in the US
Combine heat sensors to fingerprint, hand scanners◦ Confirm an actual hand is interacting
Future Applications
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Mobile Automated Fingerprint ID System◦ Comparisons made immediately over mobile networks
US border control◦ Digital photo of both index fingers for non residents◦ Combat terrorism and monitor residence permits
Digital face/fingerprint images on passports◦ Increase security/reduce processing time at borders
Enable access to secure/sensitive areas like energy supply facilities or nuclear power stations
Opportunities for digital citizen cards◦ e-government, e-banking, e-business
Future Applications
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Digital Cards
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Layered systems◦ Combines a biometric method with a keycard or
PIN
Multimodal systems◦ Combines multiple biometric methods
simultaneously to confirm identification◦ Example: iris scanner and a voiceprint system
3-D palm print systems replace 2-D◦ Much higher anti-counterfeit capability
Multiple Biometrics
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Being tested at Hong Kong Polytechnic University’s Biometrics Research Center
Uses laser scanning to construct 3-D shape of tongue
Collected in about 2-3 seconds
Tongue Scanning?
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Continually increasing revenues More companies switching to biometric
security systems Annual revenues expect $11 billion by 2017 Compound Annual
Growth Rate
Biometric Industry
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Biometric Industry Forecast
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Biometrics in Military
http://www.youtube.com/watch?v=zHRiWz8D8C0&list=PLA3DB8B404806A6DD&index=4&feature=plpp_video
http://www.youtube.com/watch?v=ATowdPuQGNY&feature=BFa&list=PLA3DB8B404806A6DD&lf=plpp_video
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Questions?