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Japanese cryptology from the 1500s to the Meiji period (1868-1912) encompasses a range of practices and developments related to cryptography and secret communication in Japan. The history of Japanese cryptology can be broadly divided into several key periods: ### 1. **Pre-Edo Period (Before the 1600s)** During this period, before the establishment of the Tokugawa shogunate, Japan was still characterized by feudal warfare.

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  1. History of cryptography
  2. Cryptography
  3. Applied mathematics
  4. Fields of mathematics
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