It depends on the fingerprint reader. They don't all make a simple image of your finger to
check the fingerprint. It seems Wikipedia has a nice article about it, so I'll just shup up:
http://en.wikipedia.org/wiki/Fingerprint_authentication
But yeah, you'd want to use it only for local authentication.
Posted Nov 25, 2007 7:59 UTC (Sun) by tzafrir (subscriber, #11501)
[Link]
It's not an image. But still an authentication token. And it can't really be replaced in case
it leaks.
And unless you always wear gloves, this information can easily leak.