密碼系統的用法和樣例：
例句
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密碼一種密碼系統，其中固定長度的明文里的單元，通常為字母，被任意倒置或按事先確定的符號系統替換
A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code. -
加密員使用、研究或改進密碼系統和密碼書寫的人
One who uses, studies, or develops cryptographic systems and writings.
