The use of two locking devices and a physical barrier for the equipment. At no time can one person have in his or her possession the combinations or keys to gain lone access to a security container or cryptographic equipment containing COMSEC material. Neither can one person have sole possession of COMSEC material that requires TPI  security. CRYPTOGRAPHIC OPERATIONS AND OPERATOR REQUIREMENTS As a Radioman, you will be required to learn and understand the more detailed procedures and processes involving   cryptographic   operations.   Cryptographic procedures and associated equipments are governed by many  strict  rules  and  standards.  To  understand cryptographic  operations  and  their  importance,  you must understand the following terminology: CRYPTO— The marking “CRYPTO” is not a security classification. This marking is used on all keying material and associated equipment to protect or authenticate national security-related information.   All   material   and   equipment marked   “CRYPTO”   require   special consideration with respect to access, storage, and handling. CRYPTOMATERIAL—  The term “crypto- material”   refers   to   all   material,   such   as documents, devices, or apparatus, that contain cryptoinformation.  Furthermore,  the  material must be essential to the encryption, decryption, or   authentication   of   telecommunications. Cryptomaterial  is  always  classified  and  is normally marked “CRYPTO.” Cryptomaterial  that  supplies  equipment  settings and  arrangements  or  that  is  used  directly  in  the encryption  and  decryption  process  is  called  keying material.  Keying  material  is  afforded  the  highest protection and handling precautions of all information and material within a cryptosystem. Keying material is always given priority when an emergency plan is implemented. CRYPTOINFORMATION— The category of cryptoinformation is always classified. This type  of  information  normally  concerns  the encryption   or   decryption   process   of   a cryptosystem.  It  is  normally  identified  by  the marking  “CRYPTO”  and  is  subject  to  all  the special safeguards required by that marking. tern”  encompasses  all  the  associated  items  of cryptomaterial that are used together to provide a single means of encryption and decryption. All items of a related nature that combine to form a system must be given the strictest security. Any failure, equipment,  or  operator  that  adversely  affects  the security of a cryptosystem is called cryptoinsecurity. GENERAL  AND  SPECIFIC  CRYPTO- SYSTEMS—  During  your  cryptographic  duties, you will sometimes hear the terms “general” and “specific”  applied  to  some  cryptosystems.  A general   cryptosystem   consists   of   a   basic principle and method of operation, regardless of the  cryptomaterials  used.  In  other  words, regardless of the types of materials or elements used, the method of operation will always be the same,   whether   encrypting,   decrypting,   or authenticating. A specific cryptosystem is one within a general system  that  is  necessary  and  confined  to  actual encryption,  decryption,  or  authentication.  These systems are identified by the short and long titles of their variables. CRYPTOVARIABLES— A cryptovariable is an element of a cryptosystem that directly affects the  encryption  and  decryption  process.  These variables  are  divided  into  two  types:  primary and  secondary. A primary cryptovariable is the most readily and frequently changed element of a cryptosystem. A secondary cryptovariable is one that permits change of circuit operation without altering the basic equipment. A secondary cryptovariable must also be used in conjunction with appropriate primary variables. The commanding officer is responsible for ensuring that personnel are thoroughly trained and certified for cryptographic duties. This training may be formal or 3-10 CRYPTO-RELATED   INFORMATION— Crypto-related information may be classified or unclassified.  It  is  normally  associated  with cryptomaterial  but  is  not  significantly descriptive of it. In other words, it does not describe  a  technique  or  process,  a  system,  or equipment   functions   and   capabilities. Crypto-related  information  is  not  marked “CRYPTO” and is not subject to the special safeguards   normally   associated   with cryptoinformation. CRYPTOSYSTEM—  The  term  “cryptosys-