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A cipher machine developed for Japanese naval attaché ciphers, similar to JADE. It was not used extensively, [5] [6] but Vice Admiral Katsuo Abe, a Japanese representative to the Axis Tripartite Military Commission, passed considerable information about German deployments in CORAL, intelligence "essential for Allied military decision making in the European Theater."
The Japanese Navy enjoyed spectacular success during the first part of the hostilities, but American forces ultimately managed to gain the upper hand through decrypting the Japanese naval codes, exploiting the aforementioned Japanese neglect of fleet defense, technological upgrades to its air and naval forces, superior personnel management such ...
Japanese army and diplomatic codes. This article is on Japanese army and diplomatic ciphers and codes used up to and during World War II , to supplement the article on Japanese naval codes . The diplomatic codes were significant militarily, particularly those from diplomats in Germany.
Which code systems involved sectioning and when the systems were used is not clear. Michael Smith mentions in The Emperor's Codes that British codebreakers were surprised by the appearance of sectioning in Japanese codes around 1937. [20] The British had been reading some Japanese codes since at least as far back as the Washington Naval Conference.
Kingendaishi Hensankai, Military history of the Imperial Japanese Navy Air Groups and Imperial Japanese Army Flying Regiments, 2001, ISBN 4-404-02945-4. Rekishi Dokuhon , Document of the war No. 52 Naval Air Group and Kamikaze , 2001, ISBN 4-404-02757-5 .
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The Imperial Japanese Navy (IJN; Kyūjitai: 大日本帝國海軍 Shinjitai: 大日本帝国海軍 Dai-Nippon Teikoku Kaigun ⓘ 'Navy of the Greater Japanese Empire', or 日本海軍 Nippon Kaigun, 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender in World War II.
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 ...