Sophisticated process-aware attacks targeting industrial control systems require adequate detection measures taking into account the physical process. This paper proposes an approach relying on automatically mined process specifications to detect attacks on sequential control systems. The specifications are synthesized as monitors that read the execution traces and report violations to the operator. In contrast to other approaches, a central aspect of our method consists in reducing the number of mined specifications suffering from redundancies. We evaluate our approach on a hardware-in-the-loop testbed with a complex physical process model and discuss our approach’s mining efficiency and attack detection capabilities.
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