Japanese cryptology from the 1500s to Meiji

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.