Marking or designator identifying COMSEC keying material used to secure or authenticate telecommunication carrying classified or sensitive U.S. Government or U.S. Government derived information. 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
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.