Article | REF: S8257 V1

Cybersecurity of Industrial Control Systems. SCADA and Industrial IoT

Author: Jean-Marie FLAUS

Publication date: November 10, 2018

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9. Analysis methods and tools

9.1 Defense in depth principle

This approach originated in the military world. In the world of risk management, we find the idea both in hazard studies for industrial facilities, notably with the LOPA method, and in nuclear safety.

The general idea is quite simple: multiple levels of protection, or lines of defense, reduce risk, since in the event of one of them failing, the others will prevent the attack from succeeding. The fundamental assumption is that each level must be independent, i.e. the failure of one level must not be linked to...

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