I was asked to give a talk on the unification of Functional Safety (FuSa) and Security for which I replied that two disciplines cannot be viewed separately from Systems Engineering. Instead of talking about safety/security interop, I explained how to build complex systems and how these systems fail. Only when you understand that we do not know how to build absolutely reliable systems and that eventually anything you create fails, you can understand how to add reliability and security mechanisms to your solutions. The summary of the presentation is:

• Envision how your solution will be operated
• Design for maintainability
• Add safety concept
• Add security mechanisms
• Build for failure

---

Systems architecture with the functional safety/security emphasis from Alan Tatourian

---