The threat of cyber-attacks to industrial automation and control system network of social infrastructure has risen. In 2010, an epoch making malware Stuxnet was discovered. Stuxnet was developed to attack the controllers in Iran nuclear fuel factory and has succeeded to hinder the oper- ation for a long term. Even if the controllers were not connected to internet, they could be targets. Stuxnet ’s subspecies were already discovered. The necessity of cyber-security measures for indus- trial control systems network (ICSN) is now seriously recognized. However, effective cyber-security measures have not been installed to ICSN yet. Based on this background, this paper aims at visu- alization of tool investment effect and proposes a systematic design approach of protection systems against cyber-attacks for ICSN.
