Important note! The KL-7 encrypts letters, numbers and spaces
into a letters-only ciphertext. This requires the SPACE,
FIG and LET keys to piggyback on the letters X, J and V.
To enable this, the KL-7 decrypts the letters Z into X,
and J into Y. Therefore, the decrypted word AXIMUT should
be interpret as AZIMUT, and abbreviation DOY as DOJ. When a
decrypted word contains the letter X or Y, the intended
letter will be obvious, as it is phonetically similar.
Any plaintext X or Y is unaffected by the piggyback and
remains X or Y after decryption. More info in the KL-7 Letters
and Figures section.
1A1 - Double-sideband
AM single channel CW Morse audio mode. AB - Air Base, oversees U.S. Air Force
base on the territory of another country. AFB - U.S. Air Force Base, located on
the territory of the United States. ACK - Acknowledgement or confirmation. AM - Before midday (ante meridiem). ARGUS AN ALR 8 - Intercept Receiver
System to locate radio transmissions. ASA - Army Security Agency, U.S.
military Signals Intelligence branch 1945 to 1977. ASAP - As soon as possible. ASSET - Secret source who cooperates
with an intelligence agency or intelligence personnel. AZIMUT (decrypted as AXIMUT)
- Horizontal angle, direction or bearing, used in radio
direction finding. BFV - Bundesamt für Verfassungsschutz -
BfV, West German federal office protection constitution,
domestic intelligence. BGS - Bundesgrenzschutz, West German
federal border protection police. Bn - Battalion, military unit. BOGUS - Fake, false, phony. BUG - Small and easy to hide listening
device for eavesdropping, wired or wireless. CC - Carbon Copy or Copy To.
CIA - Central Intelligence Agency, U.S. civilian
foreign intelligence service. COL - Colonel, military rank. COMPARTMENTALIZATION - Limiting access
to information to persons on a need-to-know basis only.
COMPROMISE - Intentional or unintentional
disclosure of names of operatives, locations or
operations. COOP - Cooperation. CULTURAL ATTACHE - Cover name CIA
station or section, integrated in embassy or diplomatic
mission. CW - Continuous Wave Morse telegraphy. DANGLE - Person from enemy intelligence
agency pretending to defect, to identify agents or feed
disinformation. DEFECTOR - Political, military or
intelligence person who changes sides, working for the
adversary. DDO - Deputy Director Operations (CIA). DIR OPS - Directorate of Operations
(CIA). DNI - Director of National Intelligence. DO - Directorate of Operations (CIA). DOJ (decrypted as DOY)
- Department of Justice. DTG - Date Time Group format, e.g. DTG
from 8 February 1964 at 22:30 Zulu (UTC) is 082230Z FEB
64 . EAVESDROPPING - listening to private
conversations or communications to gather intel without
the target's consent. ETA - Estimated Time of Arrival.
EVAC - Evacuation.
EXFILTRATION - Operation to move a person from a
hostile environment to a safe location. EYES ONLY - Security clearance where
sensitive information is only intended for a specific
group of readers. FBI - Federal Bureau of Investigation,
United States domestic intelligence and security service. FREQ - Frequency (radio). FRG - Federal Republic of Germany or
West Germany, i.e. Bundesrepublik Deutschland (BRD)
1949–1990
HF - High frequency radio waves in the 3 to 30
Megahertz range. HFDF - High-frequency radio direction
finding, also known as HF/DF or Huff Duff . GDR - German Democratic Republic or East
Germany, i.e. Deutsche Democratische Republiek (DDR)
1949-1990. GRU - Glavnoye razvedyvatel'noye
upravleniye or Main Intelligence Directorate of the
Soviet Armed Forces. Intel - Intelligence or collected
information. KGB - Komitet Gosudarstvennoy
Bezopasnosti or Committee for State Security, Soviet
security agency 1954-1991. KHz - Kilohertz unit of frequency, Hertz
x 1000. LANGLEY - CIA headquarters in Langley,
Virginia. LSB - Lower sideband single-sideband
operating mode in radio communications. MOLE - Deep cover agent or illegal,
operating inside adversary intelligence agency, with
access to secret intelligence. NCO - Non-commissioned officer (sergeant
or junior officer). NOFOR(N)- No foreign
dissemination. Sensitive intel, not be shared with
foreign people, governments or organizations. NSA - National Security Agency, U.S.
intelligence agency in the Department of Defense. NVA - Nationale Volksarmee, the National
People's Army of the German Democratic Republic (DDR) or
East Germany. OFFICE OF SECURITY - Law enforcement and
security branch of the U.S. Bureau of Diplomatic Security
1948-1985.
OPERATIVE - Professional intelligence officer or
recruited agent. OPS - Operation(s). OTP - One-time Pad, unbreakable manual
encryption system. PM - After midday (post meridiem). RV - Rendezvous point. RX - Radio reception or intercept, see
also TX. S3 - Military branch responsible for
planning and operations. SAFE HOUSE - Secure location to hide
agent, operative or defector, to avoid detection or
arrest. SCI - Sensitive compartmented
information, derived from sensitive intelligence sources
or methods.
SIGINT - Signals Intelligence, gathering
intelligence by capturing communications or electronic
signals. SIS - Secret Intelligence Service a.k.a.
Military Intelligence Section 6, the British foreign
intelligence agency. SPECIAL LIAISON - Cover name CIA head of
station or section, integrated in embassy or diplomatic
mission. SSB - Single-sideband modulation mode in
radio communications. ST or St - Street. STASI - Ministerium für
Staatssicherheit or MfS, East German Ministry for State
Security and Secret Police, 1950-1990. STATION - Cover name for CIA unit or
section abroad, often located in embassy. STB - Statní Bezpecnost (StB) or State
Security, the secret police in communist Czechoslovakia
1945-1990. SURVEILLANCE - Monitoring of activities
or people, to gather information, or to protect persons. TSCM - Technical Surveillance Counter
Measures, equipment to detect covert listening devices
i.e. bugs. TX - Radio transmission or broadcast,
see also RX. UP - United Press International,
American news agency. USMLM - U.S Military Liaison Mission,
agreement with Soviets to deploy monitoring personnel in
GDR 1946-1990. USSR - Union of Soviet Socialist
Republics or SSSR Soyuz Sovyetskikh Sotsialisticheskikh
Respublik 1922-1991.
