基于ieee 802.11i的ap硬件系统的设计与实现based on the ieee 802.11 i ap hardware system design and implementation.docx

——一堕:垦三堡盔兰堡±堂垡丝苎
摘要
随着无线局域网技术的迅速发展,其安全f-q题成为人们关注的焦点。当前市场上的无线局域网接入设备主要是符合IEEE 。由于无线电波的开放性, 无线局域网很容易受到攻击,为了保证用户的合法接入和数据的安全传输,IEEE 802,11标准使用了WEP安全机制。近年来,WEP机制存在的安全漏洞被研究人员广为发现,依赖WEP不能达到保护无线局域网安全的目的。为了解决这个问题,IEEE 。针对WEP存在的安全漏洞,从用户认证、密钥管理、数据机密性保护三个方面进行了改进。
本文首先分析了WEP中存在的安全漏洞,然后从用户认证、密钥管理、。和WEP相比,,这在提高了无线局域网安全性的同时,也对无线接入点硬件系统的性能提出了更高的要求,而目前的AP硬件系统很难胜任。
因此,,设计了一种带有密码协处
理器的嵌入式AP硬件系统,以32位ARM微处理器为基础构造AP硬件平台,提供了丰富的外围接口和灵活高效的存储器系统。因为IEEE ,增加了处理方面的开销,为了提高了AP处理
密码运算的能力,系统中用FPGA芯片作为密码协处理器,用Verilog HDL在FPGA提供
的逻辑资源中实现了Rijndael密码算法电路。同时提供了灵活的FPGAi配置方式,便于扩充和升级。。
关键字:无线局域网、密码协处理器、现场可编程门阵列、嵌入式系统
第1页
笪星.!堡查主堡主兰垡丝苎
Abstract
With rapid development of WLAN(Wireless Local work)technology,its security problem be focused by more and more most WLAN devices in the market are based on IEEE 1 1 uses WEP(Wired Equivalent Privacy)mechanism to protect data transmission securely,but security shortage is realized widely,WLAN haves not enough security by WEE In order to SO solve this problem,[EEE (Institute of Electrical and Electronics Engineers)designs the new security protocol IEEE l i, l i improves WEP from user authentication,key management and data
confidentiality protection.
Firstly this paper analyses security shortage in WEP,and then introduces security development about li from three aspects of user authentication,key management anddata confidentiality pared with WEP,That l i has used stronger cipher arithmetic and stricter authentication process call for more high-powered AP(Access Point) AP hardwares petent for this.
As a result this paper designs a new hardware system of AP with cipher CO—microprocessor based on IEEE li,this hardware system adopts 32bit ARM microprocessor and provides multiplicate