'''JN-25''' was the Japanese military naval code prior to and during World War II. The Americans and British broke (deciphered) this code months before the attack on Pearl Harbor.
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'''JN-25''' was the [[Japan]]ese military naval code prior to and during [[World War II]]. The Americans and British deciphered this code months before the attack on [[Pearl Harbor]].
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The Americans intercepted 26,581 JN-25 from September 1 to December 7, 1941, and they are apparently available for public review at the National Archives.
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The Americans intercepted 26,581 JN-25messages from September 1 to December 7, 1941, and they are available for public review at the National Archives.
Later the Japanese upgraded its code to the JN-25B, which was also broken by the [[Allies]].
Later the Japanese upgraded its code to the JN-25B, which was also broken by the [[Allies]].