Carl Constantine looks at some advanced Linux security tools,
including VPNs and Tripwire, from the viewpoint of malicious folks
who want to break into your Linux boxen.
"To stop mischievous crackers -- more commonly called
"black hats" in the security community -- from breaking in to your
network, you must learn the same tactics that they know, and become
familiar with the same tools that they use. It helps to think like
they think. Why you ask? It's better to be the first person that
finds a hole in your security before your network is compromised by
"So even though we're going to spend our time covering the
various tools available for the Linux system administrator, I don't
want you to forget to put on the black hat every now and then and
look closely at your network from the outside."