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. 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 and the shooting down of Isoroku Yamamoto in Operation Vengeance.
The Imperial Japanese Navy (IJN) used many codes and ciphers. All of these cryptosystems were known differently by different organizations; the names listed below are those given by Western cryptanalytic operations.
Read more about Japanese Naval Codes: Red Code, Blue Code, JN-11, JN-25, JN-39, JN-40, JN-152, JN-167, 1942 Chicago Tribune Incident
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“No human being can tell what the Russians are going to do next, and I think the Japanese actions will depend much on what Russia decides to do both in Europe and the Far East—especially in Europe.”
—Franklin D. Roosevelt (1882–1945)
“Yesterday, December 7, 1941Ma date that will live in infamy—the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan.”
—Franklin D. Roosevelt (1882–1945)
“Thou hast a voice, great Mountain, to repeal
Large codes of fraud and woe; not understood
By all, but which the wise, and great, and good
Interpret, or make felt, or deeply feel.”
—Percy Bysshe Shelley (1792–1822)