Study Of The Secure Access Technology Based On GB15629.11

Since WLAN (Wireless Local Area Network) first appeared in 1990, some people had thought that a new age without wired limitation was coming. But, for many reasons, such as security, WLAN has a slower development than expected. The research of this dissertation has emphasized on the secure access technology which based on the national standard GB15629.11. In this paper, theory and technique of security have been studied, the security architecture, association mechanism and components of which have been designed and realized by means of software.Firstly, the relative knowledge and standards of WLAN are introduced, the secure access technology base on the national standard GB15629.11 is discussed from system architecture, logic architecture, definition of serive and frame format, the method theoretically describes a whole process of some wireless station's access to a WLAN.Secondly, a brief analysis about the shortcome in security of the IEEE802.11 standard has been given. The security mechanism of national standard GB15629.11 WAPI which is used to improve the security of WLAN is proposed. It is composed of WAI and WPI, WAI is used to authenticate the user's idendity while WPI is focusing on data encryption. WAPI can provide the whole security protection for user's WLAN system.Thirdly, the certificate authentication mechanism is introduced. Digital certificate has been studied, while the aspect about technology, standard, system structure, application and development has been emphased.Finally, the process of some wireless station's accessing to WLAN is described particularly. The frame definition, system flowchart and kernel technology to realize the system simulation is introduced. The communication between STA and AP is implemented by using message queue and storage sharing in Linux Operating System. The process of certificate issued and revoked is implemented by using the openssl software.