Research On Security Mechanism Of WLAN

Wireless access to Internet is an international research hotspot now, so Wireless Local Area Network (WLAN) as a technique of wireless access has gotten the rapid growth. According to a series of research results, all the security mechanisms of WLAN are completely in-effective. Security problem limits the popularization of WLAN , thus the research on security is of great meaning.The dissertation makes a deep study on security mechanisms of WLAN, and summarizes experiences and lessons in previous protocol design. The dissertation proposed principle of designing security protocol, and proposed a authentication scheme based on PKI. The improvements gotten from scheme are as following:1 Authentication server authenticates AP, therefore stations can authenticate AP by using authentication server. Because there are no shared keys between AP and station, station can but authenticate AP with the help of authentication server.2. Authentication server distributes encrypted temporal key to AP and station,which greatly increases security of temporal key.3. Propose three key hierarchy, private key session key temporal key, and achieve separation of encryption key and authentication key.