摘要
在 8 0 2 1 1标准中的加密采用WEP协议 ,用于提供链路层数据传输的安全保护。目前 ,在原有WEP的基础上提出了一些改进方案 ,能提高WEP的安全性能 ,但理论上缺少严密的安全分析。笔者通过数学模型对这些解决方案以及原有WEP协议进行量化分析 ,推导出机制内各模块与整个安全机制间安全性能的对应函数关系 ,并比较了这些方案间安全性能的差异 ,证明这些安全机制可以提高原有WEP的安全性能 。
As an expansion of LAN, the WLAN reduce the cost of building a network infrastructure, to enjoy the mobile, high quality, multimedia services. The 802 11 standard for wireless networks includes a Wired Equivalent Privacy (WEP) protocol, which is used to protect link layer communications from eavesdropping and other attacks. Several serious security flaws in this protocol have been discovered and some solutions have been proposed to enhance WEP security. However, it is doubtful whether they can provide enough security as these solutions lack precisely security analysis. In this paper,concrete security analyses of various enhancing mechanisms are given. Results show that these mechanisms indeed increase security and bring significant, provable security gains in WLAN environment. The authors quantify the security as a function of the security of the primitives used, thereby enabling a user to decide how to construct an enhanced mechanism for desired demands.
出处
《中国工程科学》
2004年第10期32-38,共7页
Strategic Study of CAE
基金
"八六三"高技术计划资助项目 ( 2 0 0 2AA14 3 0 10 )
