This article discusses the basic principle of presently data encryption algorithm:DES algorithm, IDEA algorithm, RSA algorithm and Rijndael algorithm of AES,introduces some of their application and the development of data encryption technology.

• 本文讨论了目前主要的一些数据加密算法 :DES,IDEA,RSA算法及高级加密标准 ( AES)的 Rijndael算法。 介绍加密算法在网络中的有关应用及数据加密技术的发展状况