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cse443-lecture-21-ids

cse443-lecture-21-ids - Intrusion Detection Systems CMPSC...

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CMPSC 443 Introduction to Computer and Network Security - Spring 2012 - Professor Jaeger Intrusion Detection Systems CMPSC 443 - Spring 2012 Introduction Computer and Network Security Professor Jaeger www.cse.psu.edu/~tjae ger/cse443-s12/
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Page CMPSC 443 Introduction to Computer and Network Security - Spring 2012 - Professor Jaeger Intrusion Detection An IDS system find anomalies “The IDS approach to security is based on the assumption that a system will not be secure, but that violations of security policy (intrusions) can be detected by monitoring and analyzing system behavior.” [Forrest 98] However you do it, it requires Training the IDS ( training ) Looking for anomalies ( detection ) This is an explosive area in computer security, that has led to lots of new tools, applications, industry 2
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Page CMPSC 443 Introduction to Computer and Network Security - Spring 2012 - Professor Jaeger Intrusion Detection Systems IDS systems claim to detect adversary when they are in the act of attack Monitor operation Trigger mitigation technique on detection Monitor: Network, Host, or Application events A tool that discovers intrusions “after the fact” are called forensic analysis tools E.g., from system logfiles IDS systems really refer to two kinds of detection technologies Anomaly Detection Misuse Detection 3
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Page CMPSC 443 Introduction to Computer and Network Security - Spring 2012 - Professor Jaeger Anomaly Detection Compares profile of normal systems operation to monitored state Hypothesis: any attack causes enough deviation from profile (generally true?) Q: How do you derive normal operation? AI: learn operational behavior from training data Expert: construct profile from domain knowledge Black-box analysis (vs. white or grey ?) Q: Will a profile from one environment be good for others?
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