Assets & trust boundaries
Identify sensitive data, privileged actions and system boundaries before deciding which controls belong at each layer.
Defensive architecture
Security architecture around real trust boundaries
Security architecture connects identity, exposure, secrets, data flows, validation, detection and recovery to the system that actually exists. This is defensive engineering guidance, not a penetration test, formal security assessment, certification or compliance claim.
Identity first
Use explicit identities for people and services, strong authentication where appropriate, and authorization based on what each identity actually needs.
Least privilege
Reduce standing permissions and broad shared credentials. Separate read, write, administrative and automation capabilities where the system supports it.
Network & exposure
Minimize unnecessary externally reachable services and document why each exposed interface exists, who owns it and how it is maintained.
Secrets & configuration
Keep secrets out of source code and generated content. Define storage, rotation, environment separation and emergency revocation paths.
Input/output trust
Validate data at trust boundaries, encode output for its destination and treat third-party, user and AI-generated content as untrusted input.
Logging & detection
Collect useful security and operational events with clear ownership, retention and privacy constraints so unusual activity can be investigated.
Recovery is a control
Backups, tested restoration and incident access are part of security architecture because prevention alone cannot remove all failure paths.
Let’s work together
Reviewing a new or existing system?
Start with the assets, users, external exposure, privileged actions, sensitive data and recovery path rather than choosing controls in isolation.