The thing is that you cannot do 2-factor authentication
generically. You typically have password/passphrase as
one factor, and that can be done generically and is implemented
in cryptsetup. However the second factor is usually a token
or biometrics and there is no way to do these generically.
They always have to be customized to the concrete solution.
While there are generic smarcard indterfaces, they are
still problematic for this use.
ok, thanks for the info.
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