Black Chamber
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The Black Chamber, officially the Cable and Telegraph Section and also known as the Cipher Bureau, was the first peacetime cryptanalytic organization in the United States, operating from 1917 to 1929.
Black Chamber cryptanalytic work sheet for solving a Japanese diplomatic cipher, 1919
Herbert Yardley
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Herbert Osborn Yardley was an American cryptologist. He founded and led the Black Chamber, the US government's first peacetime cryptanalytic organization. Under Yardley, the cryptanalysts of the Black
Black Chamber
…under the executive branch without direct Congressional authorization, and was moved in the Army's organizational chart several times. On July 5, 1917, Herbert O. Yardley was assigned to head the Cipher Bureau, which consisted of Yardley and two civilian clerks. It absorbed the Navy's cryptanalysis functions in July 1918…
Herbert O. Yardley