What is hidden voting in espionage?

"Wen Zi Suntech" said: "If there is a hidden line, it will be famous." Those who think they can be unknown and endure humiliation and filth will surely achieve great success.

In the Spring and Autumn Period, in order to assassinate Zhao Xiangzi, Yu Rang "renamed himself a criminal"; When Wu Zixu fled from Chu and sneaked into the border of Zhaoguan, he was also incognito and muddled through; The counter-plan of the Warring States period was not adopted by Zhi Bo, so he changed his surname to Fu and fled to the hidden mountain; The strategic spies sent by Zhao Kuangyin to Nantang in the Song Dynasty, such as "Little Elders" and "Famous Monks in the North of the Yangtze River", were anonymous and mixed with the enemy, which not only ensured their own safety, but also facilitated their espionage activities.

This spacing technology has another purpose: hidden casting. That is, cast an anonymous letter (or a pseudonym letter) to inform and alienate others. During the Three Kingdoms period, Cao Cao was furious when he received an anonymous letter that wantonly slandered and abused him. Only after consultant Guo Yuan designed this case did he solve this problem. "Tang Law" also said: "secretly investing in documents, accusing people of guilt, is called investing in anonymous books." From the point of view of espionage, anonymous letters are not limited to informers, but have a wider range of applications. It can often deliberately provoke, intimidate and alienate the enemy; It can also be used to provide false information to the enemy, causing confusion or delay in the enemy's psychology, emotions, plans and actions. Because the anonymous letter itself gives people a sense of mystery, it is difficult for people to distinguish its authenticity, and they often hold the attitude of "believing in it but not believing in it", which makes the anonymous letter just have a gap.