A State authority, a legal person or a natural person operating a communication system handling classified information shall be required to prepare a communication system security project.

The communication system, the project of which was approved by the National Security Authority before 1.8.2017, can continue to be operated. However, the approval of all changes and additions to this communication system has been the responsibility of the National Cyber and Information Security Authority since 1.8.2017.

The content of the communication system security project is laid down by law No. 412/2005 Coll., on the protection of classified information and on the security capacity and particulars of the security project of the communication system and the manner and conditions for its approval by decree No. 523/2005 Coll., on the security of information and communication systems and other electronic equipment handling classified information and on the certification of shielding chambers.