They had been corresponding with one another in cipher.他们互相用密码通信。

The way you solve mono-alphabetic ciphers is never by trying to guess the key.破解单表置换密码的方法绝对不会是尝试猜测密钥。

converting their messages into ciphers把他们的消息转成密码

He's no more than a cipher in the organization.在这个组织里他仅是一个无名小卒。

He was little more than a cipher who faithfully carried out the Fuehrer's commands.他只不过是个忠实执行元首命令的走狗。

illustrations of cipher and monogram designs花押字的设计图例

He ciphered his notes with Greek characters.他把记录用希腊字母写成了密文。