to outwit biometric fingerprint devices use gelatine.

"Tsutomu Matsumoto, a Japanese cryptographer, uses gelatin, the stuff that Gummi Bears are made out of. ... 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." bruce schneier en counterpane.

how many different fingers can you get?

tsutomu matsumoto descripes in his presentation at the itu-t workshop on security in seoul also what attackers may present:

1. the registered finger (by an armed criminal)
2. an unregistered finger (an imposted finger, i.e. non-effort forgery)
3. a severed fingertip from the registered finger
4. a genetic clone of the registered finger
5. an artificial clone and the others "faultbased attacks"