Monitoring Dynamic Behavior
At a basic level an APIDS would look for, and enforce, the correct (legal) use of the protocol.
However at a more advanced level the APIDS can learn, be taught or even reduce what is often an infinite protocol set, to an acceptable understanding of the subset of that application protocol that is used by the application being monitored/protected.
Thus, an APIDS, correctly configured, will allow an application to be "fingerprinted", thus should that application be subverted or changed, so will the fingerprint change.
Read more about this topic: Application Protocol-based Intrusion Detection System
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