If for some reason you would prefer to use password authentication, I
would recommend that you look into automatic brute force detection.
There are a number of utilities in ports available for this purpose,
including security/sshguard and security/denyhosts.
good, but not really important with properly chosen password.
You can't do more than maybe 10 attempts/second this way, while cracking
10 character password consisting of just small letters and digits needs
36^10=3656158440062976 possible passwords, and over 11 milion years to
check all possibilities, so say 100000 years if someone is really lucky
and will get it after checking 1% possible password.
Of course - you must not look at logs in 100000 years and not see this 10
attempts per second.
I give this example against common paranoia that exist on that group - mix
of real "security paranoid" persons and pseudo-experts that like to repeat
"intelligent" phrases to show up themselves.
Actually - there is no need for extra protection for ssh, but for humans.
99% of crack attempts are done by "kevin mitnick" methods, not password
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