Sovereignty is a state’s ability to retain control over critical capabilities, decisions, and dependencies. In cyber security, that means more than owning territory or having laws on the books: it also means controlling the systems that power defense, government, communications, and industry. If those functions rely on foreign cloud services, imported hardware, outside software updates, or shared industrial chains, control can weaken even when the state remains politically independent.
This term matters because cyber attacks often target dependence. Ransomware, supply-chain compromise, and infrastructure disruption can force an organization or government to act under pressure from systems it does not fully control. Defenders use sovereignty thinking to reduce those risks through redundancy, trusted suppliers, local processing, resilient networks, and clear authority over data, updates, and incident response. In practice, sovereignty is about keeping essential digital choices available during crisis, not just in normal operations.