“Intruder Alert! Intruder Alert! Warning,Will Robinson!” When we heard that
ominous announcement emanating from a robot as it twisted and turned with arms
thrashing and head spinning, we sat galvanized to our televisions waiting for the
intruder to reveal itself.Would this be the end of Will Robinson, as we knew him?
All right, this might be a bit dramatic for a prelude to a discussion of intrusion
detection, but with most security administrators, when a beeper goes off
there is a moment of anxiety. Is this the big one? Did they get in? Do they own
my network? Do they own my data?
These and many other questions flood the mind of the well-prepared security
administrator. On the other hand, the ill-prepared security administrator, being
totally unaware of the intrusion, experiences little anxiety. For him, the anxiety
Okay, so how can a security-minded administrator protect his network from
intrusions? The answer to that question is quite simple, with an intrusion detection