http://www.zdnet.com.au/sweet-bypass-for-student-finger-scanner-339306878.htm
for roll call for senior students, which savvy kids may be able to circumvent with sweets from their lunch box. The system replaces the school's traditional sign-in system with biometric readers that require senior students to have their fingerprints read to verify attendance. The school principal says the system is better than swipe cards
http://www.abc.net.au/news/stories/2010/10/26/3048694.htm
because it stops truant kids getting their mates to sign-in for them. But using the Gummi Bear attack,
http://cryptome.org/gummy.htm
students can make replicas of their own fingerprints from gelatin, the ingredient in Gummi Bears, to forge a replica finger. The attack worked against a bunch of scanners that detect electrical charges within the human body, since gelatin has virtually the same capacitance
http://en.wikipedia.org/wiki/Capacitance
as a finger's skin."
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