[plug] ssh scans

[W.Kenworthy]

I have a machine where ssh has been changed from being protected by
firewall rules, to be open to the world. So of course, now I am getting
ssh scans.

There are also a small number of users whose passwords I do not
necessarily trust (time for jack the ripper!), so whats the thinking on
the best way to secure against such scans?  Is there something in ssh,
or amultiple connection firewall restriction?

BillK