If you think your systems are too obscure for an attacker to worry about, think again. Today’s intruders are happy for any victim.

Backdoors give attackers unrestricted access to a zombie system. If you plan to stop the bad guys from settling in, you’ll be interested in this analysis of the tools they might use for building a private entrance.

Track down and expose intruders with the versatile admin tool lsof.

Why wait for cron? iWatch monitors critical files and directories in realtime. This handy Perl script then notifies the user or runs a configurable command when change occurs.

The BackTrack live distribution lets you act like an intruder to test your network’s security.