Forget the Myth of the Air Gap: Machine Learning for Reliable Intrusion Detection in SCADA Systems

Lopez Perez, Rocio and Adamsky, Florian and Soua, Ridha and Engel, Thomas (2019) Forget the Myth of the Air Gap: Machine Learning for Reliable Intrusion Detection in SCADA Systems. EAI Endorsed Transactions on Security and Safety, 6 (19). e3. ISSN 2032-9393

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Abstract

Since Critical Infrastructures (CIs) use systems and equipment that are separated by long distances, Supervisory Control And Data Acquisition (SCADA) systems are used to monitor their behaviour and to send commands remotely. For a long time, operator of CIs applied the air gap principle, a security strategy that physically isolates the control network from other communication channels. True isolation, however, is difficult nowadays due to the massive spread of connectivity: using open protocols and more connectivity opens new network attacks against CIs. To cope with this dilemma, sophisticated security measures are needed to address malicious intrusions, which are steadily increasing in number and variety. However, traditional Intrusion Detection Systems (IDSs) cannot detect attacks that are not already present in their databases. To this end, we assess in this paper Machine Learning (ML) techniques for anomaly detection in SCADA systems using a real data set collected from a gas pipeline system and provided by the Mississippi State University (MSU). The contribution of this paper is two-fold: 1) The evaluation of four techniques for missing data estimation and two techniques for data normalization, 2) The performances of Support Vector Machine (SVM), Random Forest (RF), Bidirectional Long Short Term Memory (BLSTM) are assessed in terms of accuracy, precision, recall and F1 score for intrusion detection. Two cases are differentiated: binary and categorical classifications. Our experiments reveal that RF and BLSTM detect intrusions effectively, with an F1 score of respectively > 99% and > 96%.

Item Type: Article
Uncontrolled Keywords: Critical Infrastructures, SCADA, Anomaly detection, Machine Learning, SVM, Random Forest, BLSTM
Subjects: H Social Sciences > H Social Sciences (General)
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
QA75 Electronic computers. Computer science
Depositing User: EAI Editor IV
Date Deposited: 26 Mar 2021 14:00
Last Modified: 26 Mar 2021 14:00
URI: https://eprints.eudl.eu/id/eprint/2109

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