"Thanks to the end-of-term for many colleges and some K12
schools, brute-force attacks against SSH servers surged sharply
this past weekend, according to the SANS Internet Storm Center. The
sudden jump in SSH attacks merits a re-examination of how such
servers should be properly secured. Jim Owens and Jeanna Matthews
of the Department of Computer Science at Clarkson University have
published a paper on the methods that such attacks frequently
employ and on the best ways to defeat them.
"Linux systems may be secure against the viruses and trojans
that can infect Windows, but running Linux, in and of itself,
provides no protection against the type of brute force assaults
Owen and Matthews discuss..."