Supervisory Control and Data Acquisition Systems manage many of today’s citical infrastructures. They play a vital role in supporting modern society. Individuals, businesses, and governments rely on these critical controlsystems for their daily operation. Disruptions of these systems can lead to serious social and economic consequences at the national level. This paper shows relationship of objects in Supervisory Control and Data Acquisition System security incident chain and four pillars of critical information infrastracture protection. The four pillars are prevention and early warning, detection, reaction, and crisis management. The paper also classifies four pillars measures in Supervisory Control and Data Acquisition System protection based on technical and non-technical measures.

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