In communications, a cryptographic technique where the sequence of characters or bits is changed by means of a secret transformation.
通信中的一种加密技术。它用保密转换的方法改变字符或二进制位。同cryptography。
One who uses, studies, or develops cryptographic systems and writings.
加密员使用、研究或改进密码系统和密码书写的人
The analysis and deciphering of cryptographic writings or systems.
密码分析对密码书写或密码系统的分析和译解
A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code.