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The interconnectivity of modern and legacy supervisory control and data acquisition (SCADA) systems with corporate networks and the In-ternet has significantly increased the threats to critical infrastructure assets. Meanwhile, traditional IT security solutions such as firewalls, intrusion detection systems and antivirus software are relatively ineffective(More)
This paper presents an innovative, distributed, multilayer approach for detecting known and unknown attacks on industrial control systems. The approach employs process event correlation, critical state detection and critical state aggregation. The paper also describes a prototype implementation and provides experimental results that validate the intrusion(More)
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