The NATO Cooperative Cyber Defence Centre of Excellence is a multinational and interdisciplinary cyber defence hub

We do research, training and exercises in four core areas: technology, strategy, operations and law

24.04.2026

Locked Shields 2026 united the power of 41 nations to defend cyberspace

The world’s largest live-fire cyber defence exercise Locked Shields 2026, organised by NATO Cooperative Cyber Defence Centre of Excellence, ...

22.04.2026

World’s largest cyber defence exercise Locked Shields kicks off in Tallinn

The NATO Cooperative Cyber Defence Centre of Excellence (CCDCOE) today commenced Locked Shields 2026 in Tallinn, Estonia. The exercise bring...

Our Flagships

Locked Shields

Crossed Swords

International Conference on Cyber Conflict – CyCon

The Tallinn Manual

Recent publications

2026

Ontological Foundations of Cognitive Warfare

This study examines the ontological foundations of cognitive warfare and introduces a structure-centric conceptualisation that shifts the analytical focus from...

2026

POLICY BRIEF: Ukraine’s Cyber Defence Evolution: The Role of Non-State Actors and Public-Private Partnerships

Ukraine's cyber defence ecosystem has undergone a major transformation since the February 2022 full-scale Russian invasion, creating an important case...

Cooperation

Our success is built on mutually beneficial collaboration with various partners. Let us know if you are interested in cooperation with us!

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