IEEE 802.11 Wireless Lan Security

查看了文章IEEE 802.11 Wireless Lan Security overview，大概明白无线网络中的一些东西。

无线网络与有线网络的很大的不同是信号分布的到处都是，所以很容易被监听，这样网络中数据安全的传输就成为了很大的问题，于是人们发明了各种方法来保证数据的正确的传输，这个就是所谓的Wireless Lan Security.

无线局域网中，连接AP，必须要认证(authentication) ,目前主要的的Sceurity技术如下：

There are several security technologies introduced to 
solve the authentication problem and to preserve the 
privacy and integrity of data transmitted on air. 
IEEE802.11 specified three basic security technologies 
to authenticate access to the WLAN and to preserve the 
privacy of data transmitted, they are open system 
authentication, shared key authentication and WEP [1] .  
Because of the shortcoming of security technologies in 
IEEE802.11, Wi-Fi Alliance released a new security 
standard for the industry called "Wi-Fi Protected 
Access" (WPA) [8] .  WPA added two more technologies, 
namely, IEEE802.1x to improve authentication and 
TKIP for privacy and integrity of information. Recently 
IEEE published a new security standard for WLANs, the 
new standard is IEEE802.11i [22] ,  the new standard 
provides enhancements of the security shortcomings of 
WEP and it comprises all security technologies in WPA. 
In addition to that, IEEE802.11i adopts recently certified 
encryption algorithm called the "Advanced Encryption 
Standard" (AES). 

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