Thesis On Intrusion Detection System

Thesis On Intrusion Detection System-29
Specifically, we present a sequential game in which the distribution utility first chooses the optimal configuration of the IDS based on its knowledge of theft level distribution (Stage 1), and then optimally uses the configured IDS in a simultaneous interaction with the customers (Stage 2).This sequential game naturally enables estimation of the "value of information" about theft level, which represents the additional monetary benefit the distribution utility can obtain if the exact value of average theft level is available in choosing optimal IDS configuration in Stage 1.This master thesis presents a SCADA Intrusion Detection System Test Framework that can be used to simulate SCADA traffic and detect malicious network activity.

Specifically, we present a sequential game in which the distribution utility first chooses the optimal configuration of the IDS based on its knowledge of theft level distribution (Stage 1), and then optimally uses the configured IDS in a simultaneous interaction with the customers (Stage 2).This sequential game naturally enables estimation of the "value of information" about theft level, which represents the additional monetary benefit the distribution utility can obtain if the exact value of average theft level is available in choosing optimal IDS configuration in Stage 1.This master thesis presents a SCADA Intrusion Detection System Test Framework that can be used to simulate SCADA traffic and detect malicious network activity.

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In our framework, a fraction of customers are fraudulent - they consume same average quantity of electricity but report less by strategically manipulating their consumption data.

We consider two sources of information incompleteness: first, the distribution utility does not know the identity of fraudulent customers but only knows the fraction of these consumers, and second, the distribution utility does not know the actual theft level but only knows its distribution.

Our results suggest that the optimal configuration under lack of full information on theft level lies between the optimal configurations corresponding to the high and low theft levels.

Interestingly enough, our analysis also suggests that for certain technical (yet realistic) conditions on the ROC curve that characterizes achievable detection probability and false alarm probability configurations, the value of information about certain combination of theft levels can attain negligibly small values.

The IDS engines include rule-sets for the IEC 60870-5-104, DNP3 and Modbus protocols.

The IDS engines ships detected events to a distributed cluster and visualize them using a web interface.In contrast to the game with fixed IDS, in the game of tunable IDS, the distribution utility realizes a positive value from IDS, and the value increases in fraction of fraudulent customers.Next, we consider the situation in which both sources of information incompleteness are present.For the tunable IDS game, we show that the distribution utility always uses an optimal configuration with non-zero false alarm probability.Furthermore, the distribution utility does not tune the false alarm probability when the fraction of fraudulent customers is greater than a critical fraction.combination of detection probability and false alarm rate).Throughout, we assume that the theft level is greater than cost of attack.Supervisory control and data acquisition (SCADA) systems play an important role in our critical infrastructure (CI).Several of the protocols used in SCADA communication are old and lack of security mechanisms.The experiments carried out in this project show that there generally is little difference between Suricata and Snort's ability to detect malicious traffic.Suricata is compatible with signatures written in snort lightweight rules description language. The purposed framework applies additional latency to the analysis of IDS events.

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    The intrusion detection system is the software or hardware system to automate the intrusion detection process Bace and Mell, 2001, Stavroulakis and Stamp, 2010. Moreover, the intrusion prevention system IPS is the system having all IDS capabilities, and could attempt to stop possible incidents Stavroulakis and Stamp, 2010.…

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