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The original was posted on /r/todayilearned by /u/UndyingCorn on 2024-11-29 11:05:51+00:00.

Original Title: TIL In January 1944 the Australian 9th Division found the Japanese 20th Division’s entire cryptographic library in New Guinea. The codes were buried in a steel trunk during a retreat and found by engineers looking for mines. This find lead to around 36,000 messages being decrypted in March alone.