ssh public key only login - authentication | Linux Operating System
One good way to avoid intruders to go inside a Linux server thru brute force attack, is to disable any possible login using passwords.
Check this how-to to learn how to do it.
If you do this, then, how are going to be able to log into that server?
Well, using ssh public key authentication.
See this Amp at http://amplify.com/u/c8t9
via Amplify.com