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=== United Kingdom–United States === Already during [[World War II]]—two decades before the Washington–Moscow hotline was established—there was a hotline between [[No. 10 Downing Street]] and the [[Churchill War Rooms|Cabinet War Room]] bunker under the Treasury, Whitehall; with the [[White House]] in Washington, D.C. From 1943 to 1946, this link was made secure by using the very first voice encryption machine, called [[SIGSALY]].
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