In this secret code each number stands for a letter of the alphabet.
在这组密码中，每个号码代表字母表中的一个字母。
Based on the basic principles of traditional secret code theory, this paper analyses and discusses the practical technology keeping and undoing a program secret in the concentrative computer system.
本文沿用传统密码学的基本观念，对集中式计算机系统中的软件程序加密、解密实用技术进行了论述。
This paper introduces the realization of the secret code charging system in the ZXJ2000A SPC PABX, including the composition, processing, operation and management of the system.
本文介绍了ZXJ2000A用户交换机密码计费的实现方式，包括系统组成、处理过程、使用方式、管理方式等。
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