cryp·to·graph /ˈkrɪptəˌgræf/
  用密碼寫的通信
  cryptograph
  密碼
  Cryp·to·graph n.  Cipher; something written in cipher. “Decipherers of cryptograph.”
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  cryptograph
       n 1: a secret method of writing [syn: cipher, cypher, secret
            code]
       2: a piece of writing in code or cipher [syn: cryptogram, secret
          writing]
       3: a device for deciphering codes and ciphers