20 Years of STRIDE: Looking Back, Looking Forward

The invention of STRIDE was the key inflection point in the development of threat modeling from art to engineering practice.
Today, let me contrast two 20-year-old papers on threat modeling. My first paper on this topic, “Breaking Up Is Hard to Do,” written with Bruce Schneier, analyzed smart-card security. We talked about categories of threats, threat actors, assets — all the usual stuff for a paper of that era. We took the stance that “we experts have thought hard about these problems, and would like to share our results.”

Around the same time, on April 1, 1999, Loren Kohnfelder and Praerit Garg published a paper in Microsoft’s internal “Interface” journal called “The Threats to our Products.” It was revolutionary, despite not being publicly available for over a decade. What made the Kohnfelder and Garg paper revolutionary is that it was the first to structure the process of how to find threats. It organized attacks into a model (STRIDE), and that model was intended to help people find problems, as noted…

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