From Apple's site [1]:
> Touch ID does not store any images of your fingerprint. It stores only a mathematical representation of your fingerprint.
> The Secure Enclave is walled off from the rest of A7 and as well as the rest of iOS. Therefore, your fingerprint data is never accessed by iOS or other apps, never stored on Apple servers, and never backed up to iCloud or anywhere else. Only Touch ID uses it and it can't be used to match against other fingerprint databases.