Abstract
The main benefits of the access authentication in IEEE 802.11s are both easy administration of the subscribers and compatibility with IEEE 802.11i. However, there still exist some shortcomings, such as worse authentication delay, suffering from intermediate attack, lower expansibility and the inequality among users. In order to overcome these shortcomings, a zone-based hierarchical topology structure, virtual certification authority (CA), off-line CA, authorized certificates and authorized keys are used in the access authentication scheme proposed in this paper. Qualitative analysis and simulation show that the access authentication scheme would improve authentication of the 802.11s in authentication latency, security, expansibility and the inequality in users.
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