Public information systems: Information systems owned and/or operated by institutions and organizations of the Republic of Turkey, Information systems owned by natural and legal persons: Information systems owned and/or operated by natural and legal persons who are subject to the laws of the Republic of Turkey, National cyber space: The environment that is composed of public information systems and information systems operated/used by natural and public persons, Confidentiality: The characteristic of preventing the use or disclosure of information to unauthorized persons, entities or processes, Integrity: The characteristic of maintaining the accuracy and consistency of entities, Accessibility: The characteristic of being accessible and useable when demanded by an authorized entity, Critical Service: Services, which may cause; - Loss of life, - Large scale economic loss, - National security vulnerabilities or disturbance of public order, unless provided. 2016-2019 National Cyber Security Strategy 8/26