PAMAuthenticationViaKbdInt
Specifies whether PAM challenge response authentication is
allowed. This allows the use of most PAM challenge response
authentication modules, but it will allow password authentication
regardless of whether PasswordAuthentication is enabled.
[...]
PasswordAuthentication
Specifies whether password authentication is allowed. The
default is ``yes''.
[...]
PubkeyAuthentication
Specifies whether public key authentication is allowed. The
default is ``yes''. Note that this option applies to protocol
version 2 only.
„If there’s more than one possible outcome of a job or task, and one
of those outcomes will result in disaster or an undesirable consequence,
then somebody will do it that way.“ -- Edward Aloysius Murphy Jr.