cipher [ˈsaɪfɚ]

例句:

• a message in cipher
  密码信
  
• All important plans were sent to the police in cipher.
  所有重要计划均以密码送往警方.
  
• It's a telegram in cipher.
  这是密码电报.
  
• He was a social cipher, invisible after school.
  来自NEWYORKER
• She was too self-contained and skittish, a cipher.
  来自NEWYORKER
• It was the highest security Japanese diplomatic cipher.
  来自BBC