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Trust boundaries and threat model — Integrated Summary
Zero-trust architecture starts by naming the resource, operation and trust crossing, not a network address. A flow inventory follows copies, automated jobs and third parties as well as users. Each crossing needs an identity, resource, action, context, decision, enforcement point and testable record. Threat modeling distinguishes privilege abuse likelihood from impact, while shared responsibility separates provider infrastructure from customer configuration, identities and data. A defensible architecture decision states unknown assumptions, alternatives, a permitted request, a forbidden request and evidence for both.
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