SIGSALY exhibit at the National Cryptologic Museum
SIGSALY (also known as the X System, Project X, Ciphony I, and the Green Hornet) was a secure speech system used in World War II for the highest-level Allied communications. It pioneered a number of digital communications concepts, including the first transmission of speech using pulse-code modulation.
The name SIGSALY was not an acronym, but a cover name that resembled an acronym—the SIG part was common in Army Signal Corps names (e.g., SIGABA).[1] The prototype was called the "Green Hornet" after the radio show The Green Hornet, because it sounded like a buzzing hornet, resembling the show's theme tune, to anyone trying to eavesdrop on the conversation.[2]
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^"Vox Ex Machina". 99% Invisible. Retrieved 2022-03-28.
a contract for two systems in 1942. SIGSALY went into service in 1943 and remained in service until 1946. SIGSALY used a random noise mask to encrypt...
other sounds". Dudley worked with Alan Turing on the SIGSALY project for the US Military. SIGSALY was a method of transmitting speech in a secure manner...
speech. Dudley's vocoder was used in the SIGSALY system, which was built by Bell Labs engineers in 1943. SIGSALY was used for encrypted voice communications...
contracted Bell Laboratories and they developed a system called SIGSALY. With SIGSALY, ten channels were used to sample the voice frequency spectrum from...
Transatlantic Telephone Room and Churchill's office-bedroom. From 1943, a SIGSALY code-scrambling encrypted telephone was installed in the basement of Selfridges...
pulse-transmission system. The technique was first used with the WWII SIGSALY secure speech transmission system. From a mathematical perspective, an...
were known as "A-3" (from AT&T Corporation). An unrelated device called SIGSALY was used for higher-level voice communications. The noise was provided...
felt in London. In 1947, it was given to the Science Museum. The huge SIGSALY scrambling apparatus, by which transatlantic conferences between American...
started to work on a whole new system, which resulted in the Green Hornet or SIGSALY. With the Green Hornet, any unauthorized party listening in would just...
intensity proton accelerator at the Fermi National Accelerator Laboratory SIGSALY, an early secure speech system also known as "Project X" Code name of HotSauce...
photovoltaic cell was developed by Russell Ohl. In 1943, Bell developed SIGSALY, the first digital scrambled speech transmission system, used by the Allies...
top-secret US Army Signal Corps World War II communications system named SIGSALY. During World War II, Golden Age of Hollywood actress Hedy Lamarr and avant-garde...
1920s. In 1941, the Allies developed a voice encryption system called SIGSALY which used a vocoder to digitize speech, then encrypted the speech with...
adopted for use. Turing also consulted with Bell Labs on the development of SIGSALY, a secure voice system that was used in the later years of the war. Between...
was made secure by using the very first voice encryption machine, called SIGSALY. A hotline connection between Beijing and Moscow was used during the 1969...
(telephony), digital switching platform X-sistemo in Esperanto orthography SIGSALY, secure voice transmission system; sometimes called "X System" X Window...
current. — A. B. Clark patent In 1942, Clark and his team completed the SIGSALY secure voice transmission system that included the first use of companding...
scrambling's inherent insecurity. The first true secure telephone was SIGSALY, a massive device that weighed over 50 tons. The NSA, formed after World...
develops the first PCM-based digital scrambled speech transmission system, SIGSALY, in response to German interception of military telephone traffic during...
Cornflakes (1945) – insertion of propaganda into the German mail system. SIGSALY (1943—1945) – secure speech system for highest-level Allied communications...
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