create a temporary key that encrypts the memory in this portion of the system. The Secure Enclave also contains an anti-replay counter to prevent brute force attacks.
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Passcode iOS devices can have a passcode that
is used to unlock the device, make changes to system settings, and encrypt the device's contents.
Until recently, these were typically four numerical digits long. However, since unlocking the devices with a fingerprint by using Touch ID has become more widespread, six-digit passcodes are now the default on iOS with the option to switchback to four or use an alphanumeric passcode.
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Touch ID Touch ID is a fingerprint scanner that is embedded in the home button and can
be used to unlock the device, make purchases, and log into applications among other functions. When used, Touch ID only temporarily stores the fingerprint data in encrypted
memory in the Secure Enclave, as described above. There is noway for the device's main processor or any other part of the system to access the raw fingerprint data that is obtained from the Touch ID sensor.
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