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One important aspect of modern Critical Infrastructures (CI) like power grids is that the control of the physical processes (e.g., electricity transmission) is no longer done locally, but in a distributed way with SCADA/PCS systems. This distributed control is done over utility networks, typically wide-area IP networks that interconnect the CI facilities (e.g., transformation substations). This communication is critical because, if certain commands are not executed within certain time bounds, events with a severe socioeconomic impact may happen (e.g., blackouts). However, utility networks often do not ensure the required timeliness and reliability, especially when accidental or malicious faults occur.
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