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ARQ
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Automatic repeat request
Error-control method for data transmission that uses acknowledgements and timeouts
to achieve a reliable data transmission over an unreliable medium.
Also known as Automatic Repeat Query.
➤ Wikipedia
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ASCII
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American Standard Code for Information Interchange
Character encoding scheme, based on the ordering of
the English alphabet, using 7-bits to describe each letter.
Commonly used to represent text in computers, communication equipment
and other devices that use text.
Most modern encoding schemes are based on extended ASCII.
➤ More
➤ Wikipedia
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BAUDOT
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Method for sending text-based messages over wire or radio links, using a
5-bit digital code. Based on the ITA2 standard. Also known as Baudot-Murray
code and as CCITT-2.
➤ More
➤ Wikipedia
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CEOI
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Communications-Electronics Operating Instructions
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CIA
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Central Intelligence Agency
➤ Wikipedia
➤ Website
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CNR
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Combat Net Radio
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COMSEC
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Communications Security
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Covert Operation
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General term for a 'clandestine operation' legally carried by, or on
behalf of, a government body. In the US, covert operations are typically
carried out by the CIA. The expression 'covert' is sometime expanded to
include secret service work, VIP protection, surveillance and eavesdropping.
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DELTACS
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Army Corps Tactical Area Communications System
Mobile tactical area communications system providing secure, digital
communications for army corps size military units. Jointly developed by
Hollandse Signaalapparaten (HSA) in Huizen (Netherlands) and GTE
Government Systems Corporation in Massachusetts (USA).
The Dutch military communications system ZODIAC was based
on DELTACS.
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DF
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Direction Finding
When a radio transmitter is on the air for a sufficiently long period
of time, it is possible to determine the direction of the transmitter.
This is often done by using directional antennas and plotting the angle
from two or three intercept stations on a map.
It is also possible to a doppler antenna for mobile searches
and to use a simple field-streng indicator to find nearby transmitters.
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ECM
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Electronic Counter Measures
Common name for measures taken against an adversary's communications,
such as eavesdropping, interception and direction finding.
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ECCM
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Electronic Counter Counter Measures
Equipment used in secure communications (COMSEC) to protect against
counter measures, such as eavesdropping, interception and
direction finding.
Frequency Hopping (FH) and
encryption (CRYPTO) are examples of ECCM.
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EMU
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Electronic Message Unit
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EPM
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Electronic Protection Methods
Expression - frequently used by Thales
- for a radio channel that has been secured by means of electronic measures,
like encryption (CRYPTO)
and/or frequency hopping (FH).
Also known as ECCM.
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ETSI
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European Telecommunications Standards Institute
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FEC
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Forward error correction
A technique for controlling (and correcting) errors in data transmission
over an unreliable or noisy medium, such as an HF radio channel.
➤ Wikipedia
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FH
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Frequency Hopping
Method for quicky changing the frequency (channel) during a transmission
in a seemingly random order. This is done as an electronic counter counter
measure (ECCM), to protect the conversation against eavesdropping and
interception by the enemy. Popular frequency hopping systems are known
by the codenames HAVEQUICK,
M3TR and JAGUAR.
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Fill
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 Key-fill
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Filler
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Key fill device
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FM
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Frequency Modulation
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HF
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High Frequency
300 kHz - 30 MHz
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IDF
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Israel Defense Forces
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ITA2
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International Telegraph Alphabet No. 2
International standard for sending text in digital 5-bit format over
teleprinter infrastructure (telex). Also known as CCITT-2 and as
Baudot-Murray code.
➤ More
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ITA5
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International Telegraph Alphabet No. 5
International standard for sending and storing text in digital 7-bit
(actually 8-bit) format. Also known as ASCII.
➤ More
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Key
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A key is a piece of information (parameter) that determines the functional
output of a cryptographic algorithm (cipher).
Without the key, the algorithm can not be used.
➤ Wikipedia
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Key-fill
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Loading of a crypto-device with key material. Commonly achieved by using
a so-caller key fill device (or: filler) to distribute key
material.
➤ More
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Key fill device
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Device used for the distribution of cryptographic material (keys).
The device is loaded by a Key Generator, and can dump its contents to
a crypto-device or another key fill device.
➤ More
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LSB
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Lower Side Band
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Morse
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Morse Code
Method for (manually) transmitting text based messages, by encoding them
into a series of dashes and dots, and sending them by means of sound,
light or radio waves. Often used on narrow-band (short wave) radio channels.
➤ More
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NATO
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North Atlantic Treaty Organization
➤ Wikipedia
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OSS
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Office of Strategic Services
Clandestine US organisation for infiltration and sabotage activities
during WWII. The predecessor of the current CIA.
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OTAN
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NATO
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OTAR
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Over The Air Rekeying
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SF
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Special Forces
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SC
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Single Channel
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SINCGARS
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Single Ground and Airborne Radio System
Combat Radio Network used by the US Armed Forces
and part of NATO.
➤ More
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SOE
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Special Operations Executive
British Special Forces active in clandestine operations behind enemy
lines during WWII.
➤ Wikipedia
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SOI
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Signals Operating Instructions
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SSB
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Single Side Band
Modulation method, derived from AM with suppressed carrier
and one of the side-bands. The resulting side-band can be either
USB
or LSB.
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TAA
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TETRA Authentication Algorithm
Encryption algorithm used for authentication of voice and data traffic on
TETRA radio networks.
➤ More
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TEA
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TETRA Encryption Algorithm
Suite of encryption algorithms used for securing voice and data traffic on
TETRA radio networks. Known algorithms are TEA1, TEA2, TEA3 and TEA4.
➤ More
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TEMPEST
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Codename, referring to (the study of) unwanted compromising emanations.
This includes the emission of unintentional and unwanted
intelligence-bearing signals.
If such signals were intercepted and analysed, they might disclose sensitive
information. In cryptography, the interceptor might be able to reconstruct
(part of) the plain text.
➤ Wikipedia
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TETRA
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Terrestrial Trunked Radio
Digital two-way trunked radio network, developed in Europe and standardized
by ETSI. Voice and data traffic is secured by means of authentication and
encryption algorithms.
➤ More
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TITAAN
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Theatre Independent Tactical Army and Airforce Network
Codename for the current Dutch military communication system
that replaced ZODIAC in the early 2000s.
➤ More
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TTY
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Teletype
Method for sending written (printed) messages over a wire or radio link,
using a 5-bit digital code (mostly BAUDOT).
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UHF
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Ultra High Frequency
300 MHz - 3 GHZ.
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USB
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Upper Side Band
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VHF
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Very High Frequency
30 - 300 MHz.
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VINSON
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KY-57 Voice Crypto
American Voice Crypto device a.s.a. KY-57 or KY-58. Can be used in combination
with VRC radio sets and early SINCGARS radios.
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ZODIAC
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Zone Digitaal Automatisch Cryptografisch beveiligd
Codename for the integrated communications system that was used by the
Dutch Armed Forces between 1979 and the early 2000s. It is based on the
DELTACS tactical area communications system.
➤ More
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