CRYPTO

A designation or marking which identifies classified operational keying material, and which indicates that this material requires special consideration with respect to access, storage and handling.

[The] marking or designator identifying COMSEC keying material used to secure or authenticate telecommunications carrying classified or sensitive U.S. Government or U.S. Government-derived information. [INFOSEC-99] Note: When written in all upper case letters, CRYPTO has the meaning stated above. When written in lower case as a prefix, crypto and crypt are abbreviations for cryptographic. [NIS]