How is the fingerprint used for security

Dear all,
There were an excellent article last year about how the passcode is used in the security architecture of iOS
http://www.apple.com/ipad/business/docs/iOS_Security_Oct12.pdf
I was wondering how is the fingerprint used in the encrpyption mechanism.
- Is a hash generated and then the hash is compared and if ok the access is grante d?
- Is this hash is used in the deriving process of the encryption key ?
- etc ?
Many thanks in advance,
Regards

It cleans rather well for me but, i never actually touch the screen with my hands/fingers. Just get a microfiber cloth and a non-abrasive cleaner like method window cleaner from target:)
Message was edited by: demolasko

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