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- DRAFT GLOSSARY OF COMMUNICATIONS SECURITY TERMS
-
- PREPARED BY THE COMSEC ASSOCIATION and ROSS ENGINEERING
-
- February 24, 1990
-
- 301-670-0512 (voice)
- 202-364-1304 (BBS)
-
- ANI. Automatic Number Identification
-
- CNA. Customer Name and Address. This is a telephone company facility in this
- country by which telephone companies help one another by providing the name
- and address of a customer whose number is known. It is used widely by
- investigators in the practice of their profession.
-
- LLLTV. Low Light Level Television
-
- SCIF. Secure Compartmentalized Information Facility. It is a facility that
- is built to government specifications that assures that what is said in the
- room is heard only by the people in the room.
-
- STU III. Secure Telephone Unit number three (pronounced "stew three"). AT&T,
- Motorola and RCA are building these after a government sponsored development.
- They are secure telephones to be used by government contractors when talking
- about sensitive information over the telephone.
-
- TELCO. Telephone Company.
-
- TELEPHONE INSTRUMENT. The complete telephone set, including handset, ringer,
- dialing mechanism, etc.
-
- TELEPHONESE. This is a special language spoken by telephone company people.
- Some of the words in this language are necessary to properly communicate in
- this specialized area. Some, however, seem to have been chosen for the
- purpose of obfuscation.
-
- An example of a necessary telephonese expression is "SMDR" which stands for
- "station message detail recorder", an accurate description of the purpose and
- function of the device.
-
- An example of a word which seems to be intended to confuse or obfuscate is
- "transmitter". We all know that a transmitter is something which transmits,
- but the phone company people use this word when referring to a carbon
- microphone, a device which is totally passive and has no ability to transmit
- anything.
-
- Another word which can cause serious misunderstanding is "bridge". Those of
- us who have studied electronics know that a bridge is a four-terminal device
- which has many useful applications. Unfortunately, the phone company people
- use this word when they are describing a simple two-wire parallel connection.
- The reason for their choice of this word is not apparent, but they might have
- been trying to hide from the world how easy it is to hook up an extension
- telephone.
-
- There are, of course, many telephonese words which do not fall into either of
- these categories. Many terms are still in use which derived from
- characteristics which have all but disappeared from modern equipment -- words
- like "hookswitch" referring to the switch which was activated when the
- receiver was replaced in its hook on the side of the early telephones.
-
- TEMPEST. Refers to classified government effort to protect against
- compromising emanations from electronic equipment. (It may be a coined word,
- and it may be a semi-acronym from transient electro-magnetic pulse emanation
- standard.)
-
- THIRD WIRE TAP. The activating of a telephone microphone by using a third
- wire to bypass the hook switch.
-
- TITLE III. (pronounced title three). Refers to equipment for surreptitious
- interception of communications. For most people, possession, advertising,
- sale, and use of Title III equipment is a felony.
-
- TOUCH TONE. DTMF (dual tone, multi-frequency). Signalling system. Replaces
- pulse dialing.
-
- TRACKING. In any tracking system, some target is traced by some electronic
- means -- radar or whatever. The target's location is displayed on screens
- which are viewed by the operators. The vehicle tracking systems available
- today receive position information from LORAN-C receivers or dead reckoning
- systems on board the target vehicle. The tracking site is normally fixed,
- and there is no necessity (nor ability) to physically follow the target
- vehicle.
-
- TRANSDUCER. A device which converts on form of energy to another, e.g.,
- sound to electrical.
-
- TRAP & TRACE. Telephone company equipment/procedures for determining the
- source of an incoming call.
-
- TRIANGULATION. Process used to locate a transmitter by use of multiple
- direction-finding systems.
-
- TSCM. Technical Surveillance Countermeasures. Commonly called debugging,
- sweeps, or electronic sweeping. However, these terms do not adequately
- describe the full range of TSCM.
-
- TWIST. Telephone company term which refers to the fact that signals at
- different frequencies are transmitted with differing response by the
- transmission system. Usually refers to distortion of DTMF (touchtone)
- signals.
-
- ULTRASOUND. Sound too high in frequency to be heard by the human ear;
- generally above about 20 KHz.
-
- ULTRAVIOLET (UV). Light too high in frequency to be seen by the human eye.
-
- VOICE ACTUATED SWITCH (VOX). Switch that closes when sound is present at its
- input.
-
- VOX. This term originated with hams and came from 'Voice On Xmtr" or "Voice
- Operated Xmtr" where xmtr is the ham abbreviation for transmitter. It has
- come to mean any circuit which activates or turns on when it "hears" a voice
- (or sometimes any sound).
-
- WEARING A WIRE, WIRED. Agent is wearing a concealed tape recorder or
- transmitter.
-
- WHITE NOISE. Noise in which power distribution is linear through the
- spectrum. Each 1 KHz or 10 KHz has as much power as every other 1 KHz or 10
- KHz.
-
- WIRELESS MICROPHONE. Very low power short range transmitter legitimately
- used by entertainers and sportscasters as microphones.
- Used by eavesdroppers as inexpensive radio bugs.
-
- Do you have more terms you want defined, or have some improvements to what
- we've defined here? If so, please call or leave a message on the BBS. If you
- have a supplement to this glossary which you would like to share, please
- upload it to the BBS.