05-17-2002, 07:55 AM
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Executive Editor
Join Date: Aug 2006
Posts: 29,160
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Gummi bears defeat fingerprint sensors
http://www.theregister.co.uk/content/55/25300.html
Well, so much for fingerprints being a reliable bio-security measure. Sheesh - back to the drawing board for these biotech security companies!
"A Japanese cryptographer has demonstrated how fingerprint recognition devices can be fooled using a combination of low cunning, cheap kitchen supplies and a digital camera. First Tsutomu Matsumoto used gelatine (as found in Gummi Bears and other sweets) and a plastic mould to create a fake finger, which he found fooled fingerprint detectors four times out of five."
The Crypto-Gram newsletter also had this to add:
"His more interesting experiment involves latent fingerprints. He takes a fingerprint left on a piece of glass, enhances it with a cyanoacrylate adhesive, and then photographs it with a digital camera. Using PhotoShop, he improves the contrast and prints the fingerprint onto a transparency sheet. Then, he takes a photo-sensitive printed-circuit board (PCB) and uses the fingerprint transparency to etch the fingerprint into the copper, making it three-dimensional. (You can find photo-sensitive PCBs, along with instructions for use, in most electronics hobby shops.) Finally, he makes a gelatin finger using the print on the PCB. This also fools fingerprint detectors about 80% of the time."
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