摘要： 讨论了密码、协议和防火墙边三道网络安全防线。首先评价了美国国家标准技术局颁布的15个先进加密标准的候选算法，从中可以看出密码的发展趋势。然后重点探讨了电子商务协议的逻辑分析。最后介绍了超级防火墙的新思想及其功能和设计原理。

关键词: 先进加密标准（AES）, 电子商务协议, Kailar逻辑, 超级防火墙

Abstract: ?In this paper,we discuss three key factors in network security including ciphers,protocols and firewalls.Firstly,we evaIuate the l5AES candidate algorithms issued by NIST of USA,in turn we can see the trends in the development of block ciphers.Second1y,we focus on thelogic analysis of electronic conunerce protoco1s.Thirdly,we introduce the new idea of super firewall and discuss itS design principles andfunctions.

中图分类号: 

• TP393.0