Application protocol-based intrusion detection system
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An application protocol-based intrusion detection system (APIDS) is an intrusion detection system that focuses its monitoring and analysis on a specific application protocol or protocols in use by the computing system.
An APIDS will monitor the dynamic behavior and state of the protocol and will typically consist of a system or agent that would typically sit between a process, or group of servers, monitoring and analyzing the application protocol between two connected devices.
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.
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