Security Architecture

Security architecture makes security properties part of system structure. It identifies assets, actors, trust boundaries, dependencies, controls, and evidence. Start with the mission and risk, then design controls that fit how the system actually stores data, makes decisions, connects services, and recovers from failure. A trust boundary is where identity, privilege, or data handling changes. At every boundary define authentication, authorization, validation, encryption needs, logging, failure behavior, and ownership. Zero trust does not mean no trust; it means that access decisions are explicit and continuously supported by policy and evidence. Build defense in depth. Separate duties, minimize privilege, protect secrets, segment networks, harden workloads, monitor security-relevant behavior, and test recovery. A control is useful only when you can operate and verify it.