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This paper reviews the state of the art in cyber security risk assessment of Supervisory Control and Data Acquisition (SCADA) systems.
We select and in-detail examine twenty-four risk assessment methods developed for or applied in the context of a SCADA system.
Initially, SCADA systems were used in power transmission, gas pipeline and water distribution control systems.
Nowadays, SCADA systems are widely used in steel making, chemistry, telecommunications, experimental and manufacturing facilities (Daneels, Salter, 1999; Igure , 2006 ; Morgan, 2013).
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This could result from poor or improper configuration, both known and unknown hardware or software flaws, and operational weaknesses in process or technical countermeasures.
We describe the essence of the methods and then analyse them in terms of aim; application domain; the stages of risk management addressed; key risk management concepts covered; impact measurement; sources of probabilistic data; evaluation and tool support.
Based on the analysis, we suggest an intuitive scheme for the categorisation of cyber security risk assessment methods for SCADA systems.
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