(I am afraid that from the beginning, people have the instinct to keep secrets. Think about it, have you started doing this kind of work since you have memories? This is a very natural human behavior. Everyone has, and always has, some secrets. These secrets can be grasped either only by oneself, or by oneself and one who allows oneself to grasp. The easiest way to keep it private is not to tell others about it. The more people who know the "secret", the greater the possibility of leaking, and eventually the secret will not be the secret. 1.1 Encryption History In ancient times, it seemed easier to keep a secret, because only a few people had the privilege of reading and writing. If a secret is written down, only a small number of people know what it means. Secrecy can be achieved by restricting everyone from learning to write. However, this secrecy mechanism obviously has great limitations. As an ever-increasing number of people acquire the aptitude for reading and writing, it becomes increasingly necessary to preserve secrecy among these people. This need intensified during the campaign. While the actual combatants may be mostly illiterate, the clowns who start the battle are not. And both sides of the battle will undoubtedly employ some warriors who can read and write the enemy's language. Come to think of it, the military communication on the ancient battlefield may be the source of encryption!)
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