Classified information

The aim of this thesis is to describe the term classified information and to specify the ways of its protection e. g. personnel security, industrial security, administrative security, physical security, security of information and communication systems and cryptographic protection. The thesis also deals with National Security Authority which is the key administrative office for the area of the protection of classified information and for the security eligibility. Not least the thesis contains chapters about modern history of protection of classified information and recent progress in legislation. In the last chapter thesis also deals with the penalties for the violation of the regulation of protection classified information