12/16/2023 0 Comments Japanese navy world war 2![]() Coral Ī cipher machine developed for Japanese naval attaché ciphers, similar to JADE. Knowledge of the Red Book code helped crack the similarly constructed Blue Book code. A copy of the code book was obtained in a "black bag" operation on the luggage of a Japanese naval attaché in 1923 after three years of work Agnes Driscoll was able to break the additive portion of the code. The first contained the code itself the second contained an additive cipher which was applied to the codes before transmission, with the starting point for the latter being embedded in the transmitted message. It should not be confused with the RED cipher used by the diplomatic corps. It was called "Red Book" because the American photographs made of it were bound in red covers. The Red Book code was an IJN code book system used in World War I and after. All of these cryptosystems were known differently by different organizations the names listed below are those given by Western cryptanalytic operations. ![]() The Imperial Japanese Navy (IJN) used many codes and ciphers. 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. The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of World War II, and had an important influence on foreign relations between Japan and the west in the years leading up to the war as well. For Japanese army and diplomatic codes, see Japanese army and diplomatic codes.
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