NCSC Cyber Assessment Framework for U.K. Public Sector

This document is an InfoBrief detailing the NCSC Cyber Assessment Framework (CAF) and its application within the U.K. public sector. It outlines the critical importance of cyber resilience in safeguarding essential services and sensitive data against increasing cyber threats, particularly in the context of geopolitical tensions. The CAF serves as a structured tool for organizations to assess and enhance their cyber resilience, aligning with regulatory requirements and best practices. Version 4.0 of the framework, released in August 2025, emphasizes an outcome-based approach rather than a compliance checklist. It includes four objectives and fourteen principles, supported by forty-one contributing outcomes. The document discusses the current state of cyber resilience, the adoption of zero trust principles, and the specific objectives of managing security risks, protecting against cyber attacks, detecting cyber security events, and minimizing incident impact. It also highlights the role of AI in introducing new risks and the necessity for organizations to adapt their security measures accordingly.