Learn to identify and plug Linux's system holes by understanding its strengths and weaknesses. Best offensive and defensive measures for security threats are detailed.

Brian Hatch is Chief Hacker at Onsight, Inc., and author of Hacking Linux Exposed and Building Linux VPNs. He believes there's only one piece of software that he considers essential for every machine, and that's vi. Everything else is negotiable. Brian can be reached at brian@hackinglinuxexposed.com.