CRUTIAL - D4 - Preliminary Architecture Specification

The largely computerised nature of critical infrastructures on the one hand, and the pervasive interconnection of systems all over the world, on the other hand, have generated one of the most fascinating current problems of computer science and control engineering: how to achieve resilience of critical information infrastructures, in particular in the electrical sector. This problem is concerned with ensuring acceptable levels of service and, in last resort, the integrity of systems themselves, when faced with threats of several kinds. In this document we are concerned with threats against computers and control computers, not the physical infrastructures themselves. Moreover, we focus on systems with great socio-economic value, such as utility systems like electrical, gas or water, or telecommunication systems and computer networks like the Internet.