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Signals intelligence

Index Signals intelligence

Signals intelligence (SIGINT) is intelligence-gathering by interception of signals, whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT). [1]

153 relations: ADFGVX cipher, Admiralty, Ambassador, AN/SLQ-32 Electronic Warfare Suite, Anti-aircraft warfare, Anti-radiation missile, Attack on Pearl Harbor, Battle of Cape Matapan, Battle of Dogger Bank (1915), Battle of Jutland, Battle of Tannenberg, Battle of the Atlantic, Battle of the North Cape, Beat frequency oscillator, Beechcraft C-12 Huron, Black Chamber, Bletchley Park, Boeing RC-135, Boer, British Army, British Expeditionary Force (World War I), Call detail record, Central Intelligence Agency Directorate of Science & Technology, Choctaw, Claude Auchinleck, Code talker, COINTELPRO, Comanche, Communications security, Cryptanalysis, Deception, Defense Information Systems Agency, Defense Intelligence Agency, Direction finding, Dwight D. Eisenhower, ECHELON, Electronic counter-countermeasure, Electronic engineering, Electronic warfare, Encryption, Enigma machine, Erich Ludendorff, Erwin Rommel, First United States Army Group, Foreign instrumentation signals intelligence, Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008, Frequency-hopping spread spectrum, General Post Office, George Curzon, 1st Marquess Curzon of Kedleston, George S. Patton, ..., George VI, Georges Painvin, Geospatial intelligence, Global Positioning System, Goniometer, Government Communications Headquarters, Guglielmo Marconi, H. J. Round, Harry Hinsley, Heinrich von Eckardt, Henry L. Stimson, Henry Oliver, Herbert Yardley, High Seas Fleet, High-frequency direction finding, HMS Diana (1895), Human intelligence (intelligence gathering), Identification friend or foe, Imagery intelligence, Information sensitivity, Intelligence Branch (Canadian Forces), Intelligence collection management, International Telecommunication Union, Invasion of Normandy, Isoroku Yamamoto, James Alfred Ewing, James Bamford, László Almásy, List of intelligence gathering disciplines, Lockheed EP-3, Lorenz cipher, Meaconing, Measurement and signature intelligence, Mexico, Military aid, Modulation, Morse code, National technical means of verification, Navajo language, Normandy landings, North African Campaign, North Sea, Open-source intelligence, Operation Quicksilver (deception plan), Operation Salam, Operation Vengeance, Order of battle, Paul von Hindenburg, Physics, Polarization (waves), Radar, Radar jamming and deception, Radar signal characteristics, Radio frequency, Radio Reconnaissance Platoon, Radio silence, Radiofrequency MASINT, RAF Intelligence, Room 40, Royal Navy, Rupert Allason, Russian Ground Forces, Russian invasion of East Prussia (1914), Russo-Japanese War, Second Boer War, Side lobe, Sideband, Signalling System No. 7, Signals intelligence by alliances, nations and industries, Signals intelligence operational platforms by nation, Spectrum analyzer, Spoofing attack, Spring Offensive, Stealth aircraft, Subset, Suez Canal, Sunspot, Superheterodyne receiver, Suppression of Enemy Air Defenses, Surface-to-air missile, Telegraphy, Telemetry, Tempest (codename), Time of arrival, Time-division multiple access, Traffic analysis, Triangulation, U-boat, Ultra, United States Department of Defense, US signals intelligence in the Cold War, Venona project, Washington Naval Conference, Welsh language, Western Desert (Egypt), Winston Churchill, World War I, World War II, Wullenweber, Y-stations, Zeppelin, Zimmermann Telegram, Zircon (satellite). Expand index (103 more) »

ADFGVX cipher

In cryptography, the ADFGVX cipher was a field cipher used by the German Army on the Western Front during World War I. ADFGVX was in fact an extension of an earlier cipher called ADFGX.

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The Admiralty, originally known as the Office of the Admiralty and Marine Affairs, was the government department responsible for the command of the Royal Navy firstly in the Kingdom of England, secondly in the Kingdom of Great Britain, and from 1801 to 1964, the United Kingdom and former British Empire.

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An ambassador is an official envoy, especially a high-ranking diplomat who represents a state and is usually accredited to another sovereign state or to an international organization as the resident representative of their own government or sovereign or appointed for a special and often temporary diplomatic assignment.

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AN/SLQ-32 Electronic Warfare Suite

The AN/SLQ-32 is a shipboard electronic warfare suite built by the Raytheon Company of Goleta, California and The Hughes Aircraft Company.

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Anti-aircraft warfare

Anti-aircraft warfare or counter-air defence is defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action."AAP-6 They include ground-and air-based weapon systems, associated sensor systems, command and control arrangements and passive measures (e.g. barrage balloons).

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Anti-radiation missile

An anti-radiation missile (ARM) is a missile designed to detect and home in on an enemy radio emission source.

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Attack on Pearl Harbor

The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service against the United States naval base at Pearl Harbor, Hawaii Territory, on the morning of December 7, 1941.

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Battle of Cape Matapan

The Battle of Cape Matapan (Ναυμαχία του Ταινάρου) was a Second World War naval engagement between British and Axis forces, fought from 27–29 March 1941.

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Battle of Dogger Bank (1915)

The Battle of Dogger Bank was a naval engagement on 24 January 1915, near the Dogger Bank in the North Sea, during the First World War, between squadrons of the British Grand Fleet and the German High Seas Fleet.

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Battle of Jutland

The Battle of Jutland (Skagerrakschlacht, the Battle of Skagerrak) was a naval battle fought by the British Royal Navy's Grand Fleet under Admiral Sir John Jellicoe, against the Imperial German Navy's High Seas Fleet under Vice-Admiral Reinhard Scheer during the First World War.

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Battle of Tannenberg

The Battle of Tannenberg was fought between Russia and Germany between the 26th and 30th of August 1914, the first month of World War I. The battle resulted in the almost complete destruction of the Russian Second Army and the suicide of its commanding general, Alexander Samsonov.

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Battle of the Atlantic

The Battle of the Atlantic was the longest continuous military campaign in World War II, running from 1939 to the defeat of Germany in 1945.

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Battle of the North Cape

The Battle of the North Cape was a Second World War naval battle which occurred on 26 December 1943, as part of the Arctic Campaign.

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Beat frequency oscillator

In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Morse code radiotelegraphy (CW) transmissions to make them audible.

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Beechcraft C-12 Huron

The Beechcraft C-12 Huron is the military designation for a series of twin-engine turboprop aircraft based on the Beechcraft Super King Air and Beechcraft 1900.

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Black Chamber

The Black Chamber, also known as The Cipher Bureau, was the United States' first peacetime cryptanalytic organization, and a forerunner of the National Security Agency.

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Bletchley Park

Bletchley Park was the central site for British (and subsequently, Allied) codebreakers during World War II.

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Boeing RC-135

The Boeing RC-135 is a family of large reconnaissance aircraft built by Boeing and modified by a number of companies, including General Dynamics, Lockheed, LTV, E-Systems, and L3 Technologies, and used by the United States Air Force and Royal Air Force to support theater and national level intelligence consumers with near real-time on-scene collection, analysis and dissemination capabilities.

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Boer is the Dutch and Afrikaans noun for "farmer".

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British Army

The British Army is the principal land warfare force of the United Kingdom, a part of British Armed Forces.

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British Expeditionary Force (World War I)

The British Expeditionary Force (BEF) was the British Army sent to the Western Front during the First World War.

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Call detail record

A call detail record (CDR) is a data record produced by a telephone exchange or other telecommunications equipment that documents the details of a telephone call or other telecommunications transaction (e.g., text message) that passes through that facility or device.

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Central Intelligence Agency Directorate of Science & Technology

The Directorate of Science and Technology is the branch of the United States Central Intelligence Agency (CIA) charged with developing and applying technology to advance the United States intelligence gathering.

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The Choctaw (in the Choctaw language, Chahta)Common misspellings and variations in other languages include Chacta, Tchakta and Chocktaw.

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Claude Auchinleck

Field Marshal Sir Claude John Eyre Auchinleck (21 June 1884 – 23 March 1981) was a British Army commander during the Second World War.

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Code talker

Code talkers are people in the 20th century who used obscure languages as a means of secret communication during wartime.

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COINTELPRO (Portmanteau derived from '''CO'''unter '''INTEL'''ligence PROgram) (1956-1971) was a series of covert, and at times illegal, projects conducted by the United States Federal Bureau of Investigation (FBI) aimed at surveilling, infiltrating, discrediting, and disrupting domestic political organizations.

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The Comanche (Nʉmʉnʉʉ) are a Native American nation from the Great Plains whose historic territory, known as Comancheria, consisted of present-day eastern New Mexico, southeastern Colorado, southwestern Kansas, western Oklahoma, and most of northwest Texas and northern Chihuahua.

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Communications security

Communications security is the discipline of preventing unauthorized interceptors from accessing telecommunications in an intelligible form, while still delivering content to the intended recipients.

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Cryptanalysis (from the Greek kryptós, "hidden", and analýein, "to loosen" or "to untie") is the study of analyzing information systems in order to study the hidden aspects of the systems.

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Deception is the act of propagating a belief that is not true, or is not the whole truth (as in half-truths or omission).

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Defense Information Systems Agency

The Defense Information Systems Agency (DISA), known as the Defense Communications Agency (DCA) until 1991, is a United States Department of Defense (DoD) combat support agency composed of military, federal civilians, and contractors.

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Defense Intelligence Agency

The Defense Intelligence Agency (DIA) is an external intelligence service of the United States federal government specializing in defense and military intelligence.

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Direction finding

Direction finding (DF), or radio direction finding (RDF), is the measurement of the direction from which a received signal was transmitted.

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Dwight D. Eisenhower

Dwight David "Ike" Eisenhower (October 14, 1890 – March 28, 1969) was an American army general and statesman who served as the 34th President of the United States from 1953 to 1961.

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ECHELON, originally a secret government code name, is a surveillance program (signals intelligence/SIGINT collection and analysis network) operated by the US with the aid of four other signatory nations to the UKUSA Security Agreement Given the 5 dialects that use the terms, UKUSA can be pronounced from "You-Q-SA" to "Oo-Coo-SA", AUSCANNZUKUS can be pronounced from "Oz-Can-Zuke-Us" to "Orse-Can-Zoo-Cuss".

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Electronic counter-countermeasure

Electronic counter-countermeasures (ECCM) is a part of electronic warfare which includes a variety of practices which attempt to reduce or eliminate the effect of electronic countermeasures (ECM) on electronic sensors aboard vehicles, ships and aircraft and weapons such as missiles.

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Electronic engineering

Electronic engineering (also called electronics and communications engineering) is an electrical engineering discipline which utilizes nonlinear and active electrical components (such as semiconductor devices, especially transistors, diodes and integrated circuits) to design electronic circuits, devices, VLSI devices and their systems.

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Electronic warfare

Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum or directed energy to control the spectrum, attack of an enemy, or impede enemy assaults via the spectrum.

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In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized cannot.

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Enigma machine

The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-20th century to protect commercial, diplomatic and military communication.

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Erich Ludendorff

Erich Friedrich Wilhelm Ludendorff (9 April 1865 – 20 December 1937) was a German general, the victor of the Battle of Liège and the Battle of Tannenberg.

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Erwin Rommel

Erwin Rommel (15 November 1891 – 14 October 1944) was a German general and military theorist.

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First United States Army Group

First United States Army Group (often abbreviated FUSAG) was a fictitious (paper command) Allied Army Group in World War II prior to D-Day, part of Operation Quicksilver, created to deceive the Germans about where the Allies would land in France.

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Foreign instrumentation signals intelligence

Foreign instrumentation signals intelligence, FISINT (Foreign Instrumentation Signals INTelligence) is intelligence from the interception of foreign electromagnetic emissions associated with the testing and operational deployment of foreign aerospace, surface, and subsurface systems.

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Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008

The FISA Amendments Act of 2008, also called the FAA and Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008, is an Act of Congress that amended the Foreign Intelligence Surveillance Act.

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Frequency-hopping spread spectrum

Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.

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General Post Office

The General Post Office (GPO) was officially established in England in 1660 by Charles II and it eventually grew to combine the functions of state postal system and telecommunications carrier.

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George Curzon, 1st Marquess Curzon of Kedleston

George Nathaniel Curzon, 1st Marquess Curzon of Kedleston, (11 January 1859 – 20 March 1925), known as Lord Curzon of Kedleston between 1898 and 1911 and as Earl Curzon of Kedleston between 1911 and 1921, and commonly as Lord Curzon, was a British Conservative statesman.

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George S. Patton

General George Smith Patton Jr. (November 11, 1885 – December 21, 1945) was a senior officer of the United States Army who commanded the U.S. Seventh Army in the Mediterranean theater of World War II, but is best known for his leadership of the U.S. Third Army in France and Germany following the Allied invasion of Normandy in June 1944.

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George VI

George VI (Albert Frederick Arthur George; 14 December 1895 – 6 February 1952) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death in 1952.

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Georges Painvin

Georges Jean Painvin (28 January 1886 – 21 January 1980) was a French cryptanalyst during the First World War.

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Geospatial intelligence

In the United States, Geospatial intelligence, GEOINT (GEOspatial INTelligence) is intelligence about the human activity on earth derived from the exploitation and analysis of imagery and geospatial information that describes, assesses, and visually depicts physical features and geographically referenced activities on the Earth.

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Global Positioning System

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force.

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A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position.

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Government Communications Headquarters

The Government Communications Headquarters (GCHQ) is an intelligence and security organisation responsible for providing signals intelligence (SIGINT) and information assurance to the government and armed forces of the United Kingdom.

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Guglielmo Marconi

Guglielmo Marconi, 1st Marquis of Marconi (25 April 187420 July 1937) was an Italian inventor and electrical engineer known for his pioneering work on long-distance radio transmission and for his development of Marconi's law and a radio telegraph system.

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H. J. Round

Captain Henry Joseph Round (2 June 1881 – 17 August 1966) was an English engineer and one of the early pioneers of radio.

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Harry Hinsley

Sir Francis Harry Hinsley OBE (26 November 1918 – 16 February 1998) was an English historian and cryptanalyst.

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Heinrich von Eckardt

Heinrich von Eckardt (20 July 1861, Riga, Russian Empire – 3 March 1944, Jena, Germany) was a Baltic German diplomat in the service of the German Empire.

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Henry L. Stimson

Henry Lewis Stimson (September 21, 1867 – October 20, 1950) was an American statesman, lawyer and Republican Party politician.

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Henry Oliver

Admiral of the Fleet Sir Henry Francis Oliver, (22 January 1865 – 15 October 1965) was a Royal Navy officer.

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Herbert Yardley

Herbert Osborn Yardley (April 13, 1889 – August 7, 1958) was an American cryptologist.

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High Seas Fleet

The High Seas Fleet (Hochseeflotte) was the battle fleet of the German Imperial Navy and saw action during the First World War.

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High-frequency direction finding

High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II.

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HMS Diana (1895)

HMS Diana was an protected cruiser built for the Royal Navy in the mid-1890s.

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Human intelligence (intelligence gathering)

Human intelligence (frequently abbreviated HUMINT and sometimes pronounced as hyoo-mint) is intelligence gathered by means of interpersonal contact, as opposed to the more technical intelligence gathering disciplines such as signals intelligence (SIGINT), imagery intelligence (IMINT) and measurement and signature intelligence (MASINT).

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Identification friend or foe

Identification, friend or foe (IFF) is an identification system designed for command and control.

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Imagery intelligence

Imagery intelligence (IMINT) is an intelligence gathering discipline which collects information via satellite and aerial photography.

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Information sensitivity

Information sensitivity is the control of access to information or knowledge that might result in loss of an advantage or level of security if disclosed to others.

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Intelligence Branch (Canadian Forces)

The Intelligence Branch (Branche du service du renseignement) is a personnel branch of the Canadian Forces (CF) that is concerned with providing relevant and correct information to enable commanders to make decisions.

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Intelligence collection management

Intelligence collection management is the process of managing and organizing the collection of intelligence from various sources.

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International Telecommunication Union

The International Telecommunication Union (ITU; Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.

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Invasion of Normandy

The Western Allies of World War II launched the largest amphibious invasion in history when they assaulted Normandy, located on the northern coast of France, on 6 June 1944.

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Isoroku Yamamoto

was a Japanese Marshal Admiral of the Navy and the commander-in-chief of the Combined Fleet during World War II until his death.

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James Alfred Ewing

Sir James Alfred Ewing KCB FRS FRSE MInstitCE (27 March 1855 − 7 January 1935) was a Scottish physicist and engineer, best known for his work on the magnetic properties of metals and, in particular, for his discovery of, and coinage of the word, hysteresis.

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James Bamford


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László Almásy

László Ede Almásy de Zsadány et Törökszentmiklós (Almásy László Ede;; 22 August/3 November 1895 – 22 March 1951) was a Hungarian aristocrat, motorist, desert explorer, aviator, Scout-leader and sportsman who also served as the basis for the protagonist in both Michael Ondaatje's novel The English Patient (1992) and the movie adaptation of the same name (1996).

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List of intelligence gathering disciplines

This is a list of intelligence gathering disciplines.

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Lockheed EP-3

The Lockheed EP-3 is the signals reconnaissance version of the P-3 Orion, operated by the United States Navy.

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Lorenz cipher

The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II.

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Meaconing is the interception and rebroadcast of navigation signals.

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Measurement and signature intelligence

Measurement and signature intelligence (MASINT) is a technical branch of intelligence gathering, which serves to detect, track, identify or describe the signatures (distinctive characteristics) of fixed or dynamic target sources.

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Mexico (México; Mēxihco), officially called the United Mexican States (Estados Unidos Mexicanos) is a federal republic in the southern portion of North America.

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Military aid

Military aid is aid which is used to assist a country or its people in its defense efforts, or to assist a poor country in maintaining control over its own territory.

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In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.

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Morse code

Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.

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National technical means of verification

National technical means of verification (NTM) are monitoring techniques, such as satellite photography, used to verify adherence to international treaties.

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Navajo language

Navajo or Navaho (Navajo: Diné bizaad or Naabeehó bizaad) is a Southern Athabaskan language of the Na-Dené family, by which it is related to languages spoken across the western areas of North America.

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Normandy landings

The Normandy landings were the landing operations on Tuesday, 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during World War II.

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North African Campaign

The North African Campaign of the Second World War took place in North Africa from 10 June 1940 to 13 May 1943.

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North Sea

The North Sea (Mare Germanicum) is a marginal sea of the Atlantic Ocean located between Great Britain, Scandinavia, Germany, the Netherlands, Belgium, and France.

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Open-source intelligence

Open-source intelligence (OSINT) is data collected from publicly available sources to be used in an intelligence context.

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Operation Quicksilver (deception plan)

Operation Quicksilver was a Second World War military deception.

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Operation Salam

Operation Salam was a 1942 World War II military operation organised by the Abwehr under the command of the Hungarian desert explorer László Almásy.

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Operation Vengeance

Operation Vengeance was the American military operation to kill Admiral Isoroku Yamamoto of the Imperial Japanese Navy on April 18, 1943, during the Solomon Islands campaign in the Pacific Theater of World War II.

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Order of battle

In modern use, the order of battle of an armed force participating in a military operation or campaign shows the hierarchical organization, command structure, strength, disposition of personnel, and equipment of units and formations of the armed force.

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Paul von Hindenburg

Paul Ludwig Hans Anton von Beneckendorff und von Hindenburg, known generally as Paul von Hindenburg (2 October 1847 – 2 August 1934) was a Generalfeldmarschall and statesman who commanded the German military during the second half of World War I before later being elected President of the Weimar republic in 1925.

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Physics (from knowledge of nature, from φύσις phýsis "nature") is the natural science that studies matterAt the start of The Feynman Lectures on Physics, Richard Feynman offers the atomic hypothesis as the single most prolific scientific concept: "If, in some cataclysm, all scientific knowledge were to be destroyed one sentence what statement would contain the most information in the fewest words? I believe it is that all things are made up of atoms – little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another..." and its motion and behavior through space and time and that studies the related entities of energy and force."Physical science is that department of knowledge which relates to the order of nature, or, in other words, to the regular succession of events." Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves."Physics is one of the most fundamental of the sciences. Scientists of all disciplines use the ideas of physics, including chemists who study the structure of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physics. (...) You will come to see physics as a towering achievement of the human intellect in its quest to understand our world and ourselves."Physics is an experimental science. Physicists observe the phenomena of nature and try to find patterns that relate these phenomena.""Physics is the study of your world and the world and universe around you." Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.

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Polarization (waves)

Polarization (also polarisation) is a property applying to transverse waves that specifies the geometrical orientation of the oscillations.

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Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.

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Radar jamming and deception

Radar jamming and deception (electronic countermeasures) is the intentional emission of radio frequency signals to interfere with the operation of a radar by saturating its receiver with noise or false information.

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Radar signal characteristics

A radar system uses a radio frequency electromagnetic signal reflected from a target to determine information about that target.

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Radio frequency

Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.

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Radio Reconnaissance Platoon

The Radio Reconnaissance Platoon is a specially trained element of a United States Marine Corps Radio Battalion.

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Radio silence

In telecommunications, radio silence or Emissions Control (EMCON) is a status in which all fixed or mobile radio stations in an area are asked to stop transmitting for safety or security reasons.

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Radiofrequency MASINT

Radiofrequency MASINT is one of the six major disciplines generally accepted to make up the field of Measurement and Signature Intelligence (MASINT), with due regard that the MASINT subdisciplines may overlap, and MASINT, in turn, is complementary to more traditional intelligence collection and analysis disciplines such as SIGINT and IMINT.

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RAF Intelligence

Intelligence services in the Royal Air Force are delivered by Officers of the Royal Air Force Intelligence Branch and Airmen from the Intelligence Analyst Trade and Intelligence Analyst (Voice) Trade.

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Room 40

In the history of cryptanalysis, Room 40, also known as 40 O.B. (Old Building) (latterly NID25) was the section in the British Admiralty most identified with the British cryptanalysis effort during the First World War, in particular the interception and decoding of the Zimmermann Telegram which played a role in bringing the United States into the War.

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Royal Navy

The Royal Navy (RN) is the United Kingdom's naval warfare force.

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Rupert Allason

Rupert William Simon Allason (born 8 November 1951) is a military historian and journalist and former Conservative Party politician in the United Kingdom.

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Russian Ground Forces

The Ground Forces of the Russian Federation (r) are the land forces of the Russian Armed Forces, formed from parts of the collapsing Soviet Army in 1992.

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Russian invasion of East Prussia (1914)

The Russian invasion of East Prussia occurred during the First World War, lasting from August to September 1914.

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Russo-Japanese War

The Russo–Japanese War (Russko-yaponskaya voina; Nichirosensō; 1904–05) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and Korea.

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Second Boer War

The Second Boer War (11 October 1899 – 31 May 1902) was fought between the British Empire and two Boer states, the South African Republic (Republic of Transvaal) and the Orange Free State, over the Empire's influence in South Africa.

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Side lobe

In antenna engineering, side lobes or sidelobes are the lobes (local maxima) of the far field radiation pattern that are not the main lobe.

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In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing power as a result of the modulation process.

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Signalling System No. 7

Signaling System No.

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Signals intelligence by alliances, nations and industries

Many organizations, national or not, are responsible for communications security as well as SIGINT; the organization makes codes and ciphers that it hopes opponents cannot break.

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Signals intelligence operational platforms by nation

Signals intelligence operational platforms are employed by nations to collect signals intelligence, which is intelligence-gathering by interception of signals, whether between people (i.e., COMINT or communications intelligence) or between machines (i.e., ELINT or electronic intelligence), or mixtures of the two.

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Spectrum analyzer

A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument.

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Spoofing attack

In the context of network security, a spoofing attack is a situation in which a person or program successfully masquerades as another by falsifying data, to gain an illegitimate advantage.

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Spring Offensive

The 1918 Spring Offensive, or Kaiserschlacht (Kaiser's Battle), also known as the Ludendorff Offensive, was a series of German attacks along the Western Front during the First World War, beginning on 21 March 1918, which marked the deepest advances by either side since 1914.

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Stealth aircraft

Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio, collectively known as stealth technology.

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In mathematics, a set A is a subset of a set B, or equivalently B is a superset of A, if A is "contained" inside B, that is, all elements of A are also elements of B. A and B may coincide.

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Suez Canal

thumb The Suez Canal (قناة السويس) is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez.

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Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas.

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Superheterodyne receiver

A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.

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Suppression of Enemy Air Defenses

Suppression of Enemy Air Defenses (SEAD, pronounced), also known as "Wild Weasel" and "Iron Hand" operations in the United States, are military actions to suppress enemy surface-based air defenses, including not only surface-to-air missiles (SAMs) and anti-aircraft artillery (AAA) but also interrelated systems such as early-warning radar and command, control and communication (C3) functions, while also marking other targets to be destroyed by an air strike.

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Surface-to-air missile

A surface-to-air missile (SAM, pronunced), or ground-to-air missile (GTAM, pronounced), is a missile designed to be launched from the ground to destroy aircraft or other missiles.

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Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message.

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Telemetry is an automated communications process by which measurements and other data are collected at remote or inaccessible points and transmitted to receiving equipment for monitoring.

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Tempest (codename)

TEMPEST is a National Security Agency specification and a NATO certification referring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations.

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Time of arrival

Time of arrival (TOA or ToA), sometimes called time of flight (ToF), is the travel time of a radio signal from a single transmitter to a remote single receiver.

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Time-division multiple access

Time-division multiple access (TDMA) is a channel access method for shared-medium networks.

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Traffic analysis

Traffic analysis is the process of intercepting and examining messages in order to deduce information from patterns in communication, which can be performed even when the messages are encrypted.

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In trigonometry and geometry, triangulation is the process of determining the location of a point by forming triangles to it from known points.

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U-boat is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, literally "undersea boat".

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Ultra was the designation adopted by British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School (GC&CS) at Bletchley Park.

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United States Department of Defense

The Department of Defense (DoD, USDOD, or DOD) is an executive branch department of the federal government of the United States charged with coordinating and supervising all agencies and functions of the government concerned directly with national security and the United States Armed Forces.

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US signals intelligence in the Cold War

After the end of World War II, all the Western allies began a rapid drawdown of military forces, including those of signals intelligence.

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Venona project

The Venona project was a counterintelligence program initiated by the United States Army's Signal Intelligence Service (later the National Security Agency) that ran from February 1, 1943 until October 1, 1980.

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Washington Naval Conference

The Washington Naval Conference, also called the Washington Arms Conference or the Washington Disarmament Conference, was a military conference called by U.S. President Warren G. Harding and held in Washington, D.C., from 12 November 1921 to 6 February 1922.

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Welsh language

Welsh (Cymraeg or y Gymraeg) is a member of the Brittonic branch of the Celtic languages.

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Western Desert (Egypt)

The Western Desert of Egypt is an area of the Sahara which lies west of the river Nile, up to the Libyan border, and south from the Mediterranean sea to the border with Sudan.

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Winston Churchill

Sir Winston Leonard Spencer-Churchill (30 November 187424 January 1965) was a British politician, army officer, and writer, who was Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955.

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World War I

World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.

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World War II

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.

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The Wullenweber (the original name introduced by Dr. Hans Rindfleisch was Wullenwever) is a type of Circularly Disposed Antenna Array (CDAA) sometimes referred to as a Circularly Disposed Dipole Array (CDDA).

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Y-stations were British signals intelligence collection sites established during the First World War and used again during the Second World War.

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A Zeppelin is a type of rigid airship named after the German Count Ferdinand von Zeppelin who pioneered rigid airship development at the beginning of the 20th century.

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Zimmermann Telegram

The Zimmermann Telegram (or Zimmermann Note or Zimmerman Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the event that the United States entered World War I against Germany.

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Zircon (satellite)

Zircon was the codename for a British signals intelligence satellite, intended to be launched in 1988, before being cancelled.

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Redirects here:

COMINT, Comint, Communication intelligence, Communications intelligence, ELINT, Electronic intelligence, Electronics intelligence, Elint, GenCOM, GenCOM Suite, Genesis EW, SIGINT, Sigint, Signal intelligence, Signal interception, Signal-intelligence, Signals Intelligence, Signals reconnaissance, Signals-intelligence, Wireless interception, ביון אותות.


[1] https://en.wikipedia.org/wiki/Signals_intelligence

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