Mostly just a note for next time I have to do this.
Actions:
1) Edit /etc/sshd_config
``
cd /etc/
sudo cp sshd_config sshd_config.orig
sudo cat 'ChallengeResponseAuthentication no' >>sshd_config
2) Enable ssh
Go to sharing preferences and enable ssh for the relevant users.
Background
That should do it, other options are already ok by default: ``
# To disable tunneled clear text passwords, change to no here! Also,
# remember to set the UsePAM setting to 'no'.
#PasswordAuthentication no
#PermitEmptyPasswords no
Note that the comment is completely incosistent: the default is already
‘no’, and there is no need to set UsePAM no, as described further down
in the config file.