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Every Japanese code was eventually broken, and the intelligence gathered made possible such operations as the victorious American ambush of the Japanese Navy at Midway in 1942 (by breaking code JN-25b) and the shooting down of Japanese admiral Isoroku Yamamoto a year later in Operation Vengeance.
Code Girls: The Untold Story of the American Women Code Breakers of World War II. New York, Boston: Hachette Books. ISBN 978-0-316-35253-6., Chapter 10. Smith, Michael (2000). The Emperor's Codes: Bletchley Park and the breaking of Japan's secret ciphers. London: Bantam Press. ISBN 0593-046412.
The break into the PURPLE system, and into Japanese messages generally, was the subject of acrimonious hearings in Congress post-World War II in connection with an attempt to decide who, if anyone, had allowed the disaster at Pearl Harbor to happen and who therefore should be blamed. During those hearings the Japanese learned, for the first ...
A similar break into the most secure Japanese diplomatic cipher, designated Purple by the US Army Signals Intelligence Service, started before the US entered the war. Product from this source was called Magic. On the other side, German code breaking in World War II achieved some notable successes cracking British naval and other ciphers.
Analog of the Japanese Type B Cipher Machine (codenamed Purple) built by the U.S. Army Signal Intelligence Service Purple analog in use. In the history of cryptography, the "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign ...
OP-20-G did some work on Japanese diplomatic codes, but the organization's primary focus was on Japanese military codes. The US Navy first got a handle on Japanese naval codes in 1922, when Navy agents broke into the Japanese consulate in New York City , cracked the safe, took photographs of pages of a Japanese navy codebook, and left, having ...
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Herbert Osborn Yardley (April 13, 1889 – August 7, 1958) was an American cryptologist.He founded and led the cryptographic organization the Black Chamber.Under Yardley, the cryptanalysts of The American Black Chamber broke Japanese diplomatic codes and were able to furnish American negotiators with significant information during the Washington Naval Conference of 1921–1922.