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Signals intelligence
Videos
Signals intelligence is the act and field of intelligence-gathering by interception of signals, whether communications between people or from electronic signals not directly used in communication. As
RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UKUSA Agreement in 2005
RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UKUSA Agreement in 2005
A German message intercepted by the British during World War II, signaling Germany's unconditional surrender
A German message intercepted by the British during World War II, signaling Germany's unconditional surrender
Zimmermann Telegram, as decoded by Room 40 in 1917
Zimmermann Telegram, as decoded by Room 40 in 1917
A Mark 2 Colossus computer. The ten Colossi were the world's first programmable electronic computers, and were built to break the German codes.
A Mark 2 Colossus computer. The ten Colossi were the world's first programmable electronic computers, and were built to break the German codes.
Enigma machine
Videos
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany du
Signals intelligence
…forces in World War II came under the code name "Ultra", managed from Government Code and Cypher School at Bletchley Park. Properly used, the German Enigma and Lorenz ciphers should have been virtually unbreakable, but flaws in German cryptographic procedures, and poor discipline among the personnel carrying…
Military Model Enigma I, in use from 1930
Military Model Enigma I, in use from 1930
A memorial in Bydgoszcz, Poland, to Marian Rejewski, the mathematician who, in 1932, first broke Enigma and, in July 1939, helped educate the French a
A memorial in Bydgoszcz, Poland, to Marian Rejewski, the mathematician who, in 1932, first broke Enigma and, in July 1939, helped educate the French and British about Polish methods of Enigma decryption
Enigma in use, 1943
Enigma in use, 1943
Enigma rotor assembly. In the Enigma I, three movable rotors are sandwiched between two fixed wheels: the entry wheel, on the right, and the reflector
Enigma rotor assembly. In the Enigma I, three movable rotors are sandwiched between two fixed wheels: the entry wheel, on the right, and the reflector on the left.