Meanwhile, the advice to anybody particularly concerned with security on the iPhone 5s is to pair Touch ID with a complex
alphanumeric passcode, which will be automatically required after five failed attempts to unlock the handset with a fingerprint.
Or for even stronger protections, use
an alphanumeric passcode.
Private keys are
the alphanumeric passcodes which give you access to your cryptocurrencies, like Bitcoin.
Not exact matches
The longer the
passcode (or
alphanumeric password), the tougher it will be for an attacker to gain access to your device.
Note, there are also options to use a different type of
passcode such as an
alphanumeric code, which is a traditional password, a custom numeric code, or if you're using iOS 9, you can resort the older and less secure 4 - digit
passcode (not recommended).
On your iPhone or iPad, tap «
Passcode Options» and select Custom
Alphanumeric Code.
Tap
Passcode Options and choose Custom
Alphanumeric Code.