How an IDS Detects an Intrusion?
Anomaly Detection - Anomaly detection, or “not-use detection,” differs from signature recognition. An anomaly is detected when an event occurs outside the tolerance threshold of normal traffic.Therefore, any deviation from regular use is an attack. Anomaly detection detects intrusions based on the fixed behavioral characteristics of the users and components in a computer system. (P.1480/1464)
An anomaly-based intrusion detection system, is an intrusion detection system for detecting both network and computer intrusions and misuse by monitoring system activity and classifying it as either normal or anomalous. The classification is based on heuristics or rules, rather than patterns or signatures, and attempts to detect any type of misuse that falls out of normal system operation. This is as opposed to signature-based systems, which can only detect attacks for which a signature has previously been created.
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