Technical point of view | Changan Wanglou? This is just the tip of the ancient Chinese cryptography application.
01 Introduction
Figure | Network
Zhang Xiaojing was able to take advantage of the Wanglou and its communication system in the process of chasing the wolf. Each square in Chang'an City has two or three towers, which monitor the city in real time and use different combinations of purple and white squares to quickly pass the message to Zhang Xiaojing and the intelligence center Jingan, so that they can make quick decisions.
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Figure | Network
Figure | Calculations presented by the China Science and Technology Museum
It is worth mentioning that in ancient China, the Spring and Autumn Period and the Warring States Period began to use the counting method, which left a glorious record in the history of mathematics. The ancient generals were even more "strategic" and decided to win thousands of miles away.
Figure | Qin Duhu of the Shaanxi History Museum
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