单词substitution cipher
un.: 代用密码;代换码网络: 置换密码;代换密码;替换加密法
代换码
代用密码
Julius Caesar, for example, is known to have employed a simple substitution cipher to protect messages from unauthorized viewers.
例如传说中恺撒大帝就曾使用简单的替换加密来防止未经授权者读懂消息。