TechCrunch reports on Apple filing a patent application for Touch ID.

The patent describes a system that not only siloes data on the Touch ID “enclave” section of the A7 processor, but that also encrypts the fingerprint maps registered on the device to make it that much more difficult for any thieves to even attempt to pull the data off in any kind of usable form. The enclave is a one-way street, too: the system can check new fingerprints against the stored ones, but there’s no way to check or call up the stored fingerprints at all for external examination once they’re registered.