cipher device

例句：

1. 1. The cipher device is used to encrypt and decrypt messages.
   密码装置用于加密和解密消息。
2. 2.The government has installed a new cipher device to improve security.
   政府已经安装了一个新的密码装置以提高安全性。
3. 3. The cipher device was designed to be undetectable by electronic surveillance.
   密码装置被设计成无法被电子监视设备探测到。