Towards Interdependent Safety Security Assessments using Bowties
英文摘要：
We present a way to combine security and safety assessments using Bowtie Diagrams. Bowties model both the causes leading up to a central failure event and consequences which arise from that event, as well as barriers which impede events. Bowties have previously been used separately for security and safety assessments, but we suggest that a unified treatment in a single model can elegantly capture safety-security interdependencies of several kinds. We showcase our approach with the example of the October 2021 Facebook DNS shutdown, examining the chains of events and the interplay between the security and safety barriers which caused the outage.
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