The Research Of Security And Authentication System Of WLAN

With the rapid growth of WLAN, the application of the wireless LAN is more and more extensive and the technology of the wireless LAN has got widely deployed in succession in many fields. While the rapid development of WLAN , security in network has put forward high demands too. Most WLAN based on 802.11 standard adopts WEP as security mechanism to guarantee the data security in the wireless LAN. For lack of taking the security problems into consideration at the time when WEP was designed, some security flaws are left behind in WEP. The rapid development of WLAN urges the exposure of the security flaws, resulting in WEP cannot meet the security requirement in WLAN. Base on the analysis of main security problems of WEP, this paper presents a solution of security problems to WLAN, and have realized AES algorithm with software.This paper has analysed security characters and security requirements of WLAN at first. Then we have studied the five main security flaws existing in WEP which include the encrypting mechanism of WEP, key management, IV reuse, message authentication code and authentication. Then we have further investigated IEEE and some other improved security protocols such as TKIP, 802.1x, 802.11, WPA have put forward by some organizations. We also have studied the operation principle of these agreements and analysed their advantages and disadvantages .Finally we put forward the improved scheme of the security problem of WLAN. Thisscheme based on topological structure of wireless LAN having center which includes three basic modules: identity authenticationn key management data encrypting and information authentication. In order to guarantee the security, in scheme design we have adopted mutual identity authentication mechanism based on 802.1X/EAP-TLS, presented a dynamic key management mechanism, adopted Rijndael algorithm's implementation in CBC mode to provide authenticated encryptation, analysed the global performance of this security scheme and proved exactness of the improved schme.Zhou jie (Pattern recognition & intelligent system)Supervised by Prof. Guo fang...