SSH's cryptographic host-based authentication is
more secure than .rhosts authentication. However, it is
not recommended that hosts unilaterally trust one another, even
within an organization.
The default SSH configuration disables host-based authentication. The appropriate
configuration is used if no value is set for HostbasedAuthentication.
To explicitly disable host-based authentication, add or correct the
following line in
/etc/ssh/sshd_config:
HostbasedAuthentication no