What is a classified information system (CIS)?

A classified information system (CIS) is defined as a computer system specifically designed to process, store, or transmit classified information. This definition emphasizes the specialized nature of these systems, which are built with stringent security measures to protect sensitive information from unauthorized access. These security features ensure that classified data—pertaining to national security and defense—is handled appropriately, in compliance with regulations governing the protection of such information.

The focus on processing, storing, or transmitting classified information distinguishes a CIS from other types of information systems. Systems designed for public information sharing or general tasks like tracking work hours do not necessitate the same level of security and are therefore not classified information systems. Similarly, a regular database lacking security features cannot handle classified data due to the inherent risks it poses. Therefore, the correct characterization of a CIS encompasses its role and the critical security requirements associated with managing classified information.