The Crossings — Spotting Where Your Data Is At Risk Before You Build

The craft of threat modelling for a small project, made plain: before you build, draw it simply, follow the data through it, and find the crossings — where data passes between what you control and what you don't — because the crossings are where the risk lives. Then think what could go wrong at each, and decide what to do.

What you'll learn

• Threat-model a small project by hand: draw it simply, follow the data through it, and find what's sensitive and where it goes.
• Draw the trust boundary and find the crossings — where data passes between what you control and what you don't — the high-risk points.
• Think what a misuser or an accident could do at each crossing, and decide on each risk (reduce, block, or knowingly accept) worst-first.
• See through 'we'll secure it later' and 'we thought of everything' — look early, and hold threat modelling as a habit you return to.

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