The environments in which we all work have become more complicated as the years have passed, and one of the outcomes is that they are far more difficult to test for vulnerabilities. Since many years ago when Dan Farmer and Wietse Venema wrote their seminal paper, "Improving the security of your site by breaking into it," the process of security testing has both improved and become more difficult. Today, unlike when Farmer and Venema wrote their paper, we actively invite strangers into our networks. Well, not exactly all the way in, but far enough to cause concern if the perimeter is not very secure. Never before has the notion of layered security been more important.
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