encryption can be configured.
+[[pveum_tfa_auth]]
Two factor authentication
-------------------------
https://developers.yubico.com/Software_Projects/YubiKey_OTP/YubiCloud_Validation_Servers/[
host your own verification server].
+[[pveum_user_configured_totp]]
User configured TOTP authentication
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
recommended to test the configuration with multiple browsers, as changing the
'AppId' later will render existing 'U2F' registrations unusable.
+[[pveum_user_configured_u2f]]
Activating U2F as a user
~~~~~~~~~~~~~~~~~~~~~~~~