Comsec Material Control System (CMCS) definition in Computer Security terms:
Definition(s): The logistics and accounting system through which COMSEC material marked CRYPTO is distributed, controlled, and safeguarded. Included are the COMSEC central offices of record (COR), cryptologistic depots, and COMSEC accounts. COMSEC material other than key may be handled through the CMCS. Electronic Key Management System (EKMS) and Key Management Infrastructure (KMI) are examples of tools used by the CMCS to accomplish its functions.
Source(s): CNSSI 4009-2015 (CNSSI 4005)
reference: CSRC Glossary