World War II Japanese cryptography refers to the cryptographic methods and systems used by Japan during World War II for secure communication. The Japanese military and government employed various techniques to encode and decode messages, some of which were highly sophisticated. Key aspects of Japanese cryptography during this period include: 1. **Cipher Machines**: The Japanese used several cipher machines, the most notable being the **Purple machine** (JN-25). This machine was an electro-mechanical device used to encrypt diplomatic messages.
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