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No network security system or firewall can ever be completely foolproof, Chu says. So there is always a need for a \ufffdwatchdog\ufffd to patrol the network and signal when an intrusion occurs. Commercially available \ufffdwatchdog\ufffd systems depend on traditional statistical techniques. However, the newer \ufffdsmart\ufffd methods promise to have a significant impact on accuracy.

Even the cleverest intruder leaves electronic footprints on breaking and entering a secure computer data network such as bank, medical or credit records. The new smart methods can collect information from a variety of sources within the network, learn the patterns typical of a perpetrator trying to gain a level of control similar to that of the people who legitimately operate the network, and make a reasoned prediction about whether the pattern represents intrusion or not.
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