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Some easy ways to configure SSH to be a little more secure:

Edit /etc/ssh/sshd_config as root.

• Change the port (default is 22)
• Change “PermitRootLogin yes” to “PermitRootLogin no”
• AddUser username
• save and quit
• restart the ssh server: sudo /etc/init.d/ssh restart

More info here:
http://ubuntu-tutorials.com/2007/02/14/what-you-ought-to-know-about-securing-ssh/