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在军队通讯联系中一般要使用密码,以防军事机密向外泄漏。商业活动也有密码,有关商品库存、进货成本等都是保密的内容。常见的是用暗语代替数字,供内部交谈,不让别人知道底细。据考证,这种数字代码早在宋代就有了。宋代商人把“丁不勾、示不小、五不直、罪不非、吾不口、交不叉、皂不白、分不刀、馗不首、针不金”分别取代从一到十这10个数字。这套暗码设计十分巧妙,然而保密性不强,只要识破其中一个暗码的结构,就能将10个暗码依次破译。
In the military communications generally use the password to prevent leakage of military secrets. Commercial activities also have a password, the inventory of goods, purchase costs are all confidential content. It is common to use codewords instead of numbers for internal conversations to prevent others from knowing the details. According to research, this digital code as early as the Song Dynasty there. Song merchants put “Ding not hook, showing not small, five straight, sin is not, I do not speak, pay no fork, soap is not white, not knife, not not the first, the needle is not gold,” replaced from one to ten These 10 numbers. This password design is very clever, but the confidentiality is not strong, as long as one of the password to see the structure of the password, you can decrypt the password 10 in turn.