I think the ideas suggested so far all have their advantages, but wanted to suggest one more that I use. If only allowing key based authentication is not an option I only allow two login attempts per minute(via iptables). So the scripts time out when trying to run against my server, and they usually give up and move on. You may also want to use john the ripper to enforce decent passwords among your users. Also always keep your ssh server(and PAM) up to date with the newest security patches.

Kyle

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