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Which of these detection methods depends on noticing unexpected behavior in the system?
All of these
Signature based
Change based
Anomaly based
An anomaly/heuristic-based IDS examines ongoing traffic, activity, transactions, or behavior for anomalies on networks or systems that may indicate attack. The underlying principle is the notion that “attack behavior” differs enough from “normal user behavior” that it can be detected by cataloging and identifying the differences involved. By creating baselines of normal behavior, anomaly-based IDS systems can observe when current behavior deviates statistically from the norm. This capability theoretically gives anomaly-based IDSs abilities to detect new attacks that are neither known nor for which signatures have been created. A signature/pattern-based IDS examines ongoing traffic, activity, transactions, or behavior for matches with known patterns of events specific to known attacks. As with antivirus software, a signature-based IDS requires access to a current database of attack signatures and some way to actively compare and match current behavior against a large collection of signatures. Except when entirely new, uncataloged attacks occur, this technique works extremely well. http://www.windowsecurity.com/articles-tutorials/intrusiondetection/WhatYouNeedtoKnowAboutIntrusionDetection_Systems.html
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