Cyber Defendable Core

Context

Regulated and safety-adjacent operating environment; audit survivability and bounded failure as design constraints.

Architecture problem

Establishing enforceable segmentation and governance that reduces blast radius while preserving operational throughput.

Decisions and trade-offs

• Control hierarchy designed for enforceability across heterogeneous estates.
• Identity-first architecture prioritised to simplify policy and reduce exception paths.
• Resilience treated as a control surface (containment, recovery, and assured degradation).

Outcomes

• Reduced systemic risk via tighter failure-domain boundaries and governance enforcement.
• Improved auditability through standardised control evidence pathways.
• Improved recoverability assumptions and operational survivability.