Abstract
Industrial Control Systems (ICS) are used for monitoring and controlling critical infrastructures such as power stations, waste water treatment facilities, traffic lights, and many more. Lately, these systems have become a popular target for cyber-attacks. Security is often an afterthought, leaving them vulnerable to all sorts of attacks. This article presents a formal approach for analysing the security of Industrial Control Systems, both during their design phase and while operational. A knowledge- based system is used to analyse a model of the control system and extract system vulnerabilities. The approach has been validated on an ICS in the design phase.
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