Critical Infrastructure security is of supreme importance in protecting systems and services that are vital to society and the economic power and water-sharing networks, transportation, and communications grids. The real-world, high-profile consequences of a cyber-attack could include service interruption, environmental damage, financial loss, and corporal injury on a large scale. Alongside this, there is the often enormous task of managing a large number of customers, handling data relating to usage, payments, and connection status, as well as dealing with geographically assorted legacy systems.