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Security-informed safety

This page provides information on assuring safety systems so they are also secure

Last Updated 15 November 2022


Society depends on highly connected and complex sociotechnical systems.The threats to systems have been increasing and the increased connectivity of systems exposes them to more frequent and different attacks. It also introduces more complex consequences of failure and interdependencies.

Security and safety are therefore closely interconnected and interdependent. A safety justification, or safety case, is incomplete and unconvincing without a consideration of the impact of security.

In other words “If it's not secure, it's not safe".


The suite of guidance documents below covers extensive information on the approach to security-informed safety assurance and the Claims, Arguments and Evidence (CAE) methodology.

The Introduction to guidance document provides an introduction to the significance of security-informed safety and overview of the suite of guidance resources.

These guidance can be divided into three layers:

  • detailed generic guidance on security-informed safety – the overall approach
  • practical illustrative example-based guidance
  • a set of generic guides on assurance case concepts and their application that provide the basis for the other guides


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