Overview Security Issues Usability Issues Bring it all together Discussion
Sequence of ridges and valleys No two fingerprints can be exactly the same Even two imprints from the same finger are different Reliable and efficient biometric Still are cons Scanners work by imaging the print and using an algorithm to compare images http://denis.biometric-fingerprint.com/?cat=7 http://en.wikipedia.org/wiki/Fingerprint
Storage How are the fingerprints stored? Who can access them? Privacy Can fingerprints lead to more information? Device Is it susceptible to over the shoulder peeks? Does it leave a trace? Can it be spoofed?
What failed… One-step method of taking a print directly from the source (no cast) Gummy bears: Myth busted! ▪ Wouldn’t even hold a fingerprint Tac N’ Stik worked too well ▪ Picked up old prints from the scanner Silly putty stuck to the device Play-Doh was too soft to withstand pressure
Success! Very soft piece of wax flattened against hard surface Press the finger to be molded for 5 minutes Transfer wax to freezer for 10-15 minutes Firmly press modeling material into cast Press against the fingerprint reader Replicated several times
Modified approach on the APC device Requires less pressure so Play-Doh can be used Form the Play-Doh around the scanner surface Then place the flat surface in the cast More patience required to get authorized After time, the mold becomes too soft to use
Caveats Molding material becomes firm and brittle quickly ▪ Hard to make a cast ahead of time Very high quality mold is required ▪ Attacker may need more advanced materials All molds were of the thumb ▪ Smaller prints may cause additional problems
The main usability factors for fingerprints: Scanner height/angle Training conditions Age Habituation Supervision
Height/Angle Efficiency (time) not significantly affected by height or angle Quality significantly affected by height but not angle ▪ Still hard to determine optimal height Overall satisfaction affected by height, angle, and user height http://zing.ncsl.nist.gov/biousa/docs/NISTIR-7504%20height%20angle.pdf
Age 18-25 age range gave consistent good prints Prints get worse as age increases Men overall better than women Habituation No trend to print quality over time Users didn’t know how to fix bad prints http://zing.ncsl.nist.gov/biousa/docs/WP302_Theofanos.pdf
Training/Supervision Poster had worst success rate: 56% Verbal vs. video instruction had equal success Assistance significantly increased success rate ▪ 78% without assistance ▪ 98% with assistance http://zing.ncsl.nist.gov/biousa/docs/NISTIR-7403-Ten-Print-Study-03052007.pdf
Can better usability solve the spoofing problem? It can help Smaller scanning area Slap vs. roll Better algorithms with better feedback
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