● SAFER CYBERSPACE CYBERSECURITY is a matter of national sustainability Cybersecurity is more than an IT concern – it is a matter of national sustainability, argue Taavi Viilukas, Irina Klementi and Kaido Tee from the National Cybersecurity Department of the Ministry of Justice and Digital Affairs. T he digital nervous system that underpins public- and private-sector services is highly complex. The reliability of each node depends on the presence and integrity of others. If one node becomes inaccessible, it disrupts all interconnected systems and services. This interdependence makes cybersecurity an integral part of the broader framework, which requires constant attention. DIRECTION AND PURPOSE Without a national policy and strategic direction in cybersecurity, efforts would resemble Brownian motion – random, uncoordinated movements lacking a unified goal. Imagine a country where cybersecurity is managed through isolated projects and ad hoc decisions. Each organisation would act according to its best judgment, but the result would be a fragmented system unable to respond effectively to threats or ensure the continuity of critical services. Such a state would undoubtedly be highly vulnerable. 42 It is, therefore, essential for digitally advanced nations, including Estonia, to establish and implement cybersecurity policies grounded in a long-term vision and a systematic approach. Citizens, businesses, critical infrastructure and the public sector must understand and commit to a shared goal. Unified policies ensure that cybersecurity measures are coordinated, mutually reinforcing and quickly adaptable to evolving threats. Only then can a country maintain resilience and security. The architecture of national information systems must account for potential interdependencies and risks. Every new system or technology should be assessed for its impact on the broader ecosystem, guided by thorough risk analysis. Risk assessment is not a one-time project but an ongoing process that adapts to changing threat landscapes and technological developments. Cybersecurity is more than an IT concern; it is a matter of national sustainability. Just as system resilience testing and regular risk assessCYBER SECURITY IN ESTONIA 2025