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.

• 本文中，作者对无线局域网协议的安全机制进行了深入的研究，总结了协议设计中的经验教训，提出了安全协议设计准则，并提出了一个基于公钥基础设施PKI体系的认证方案，本方案的改进之处主要在于：