摘要
保护网络系统中的硬件、软件及其数据不受偶然或恶意原因而遭到破坏、更改、泄露，保障系统连续可靠地运行，网络服务不中断，成为网络安全的主要内容。
本文侧重于网络通信安全这一方面，而密码学正是研究通信安全保密的科学，是保护信息在信道的传递过程中不被敌方窃取、解读和利用的方法。通信安全保密研究围绕寻找更好更强的密码体制而展开，这些正是本文所要讨论的中心问题。本文共分六章，详细介绍了加密技术，在此基础上列举了des、rsa、dss/dsa等算法及pgp加密系统，并对其进行了分析、比较。

关键词：数据 通信 加密 密钥 密码

abstract
it becomes an important content of network security to protect hardware、software and the data in network system not to be destroyed、changed and divulged because of accidental and malicious reason, and ensure the system to run continuously and regularly and the network service system not to be paused.
this paper emphasizes particular on network communication security. cryptography is a scientific that researches communication security encryption and a method that protects the messages to be stolen、broken and used by the opposition side. the research of communication security encryption centers on seeking a better cipher system. it is a center problem that this paper is being discussed. this paper is divided into 6 chapters. it introduces detailedly encryption security, cites dsa、rsa、dss/dsa and pgp encryption system, and analysts and compares them.

key-words: data communication encryption key cipher


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