Nowadays the application deployment of WLAN (wireless local area network) between aircraft and ground air-port is increasingly widely used. However,the reasonable design and planning for its security access communication has not been proposed. So WLAN security vulnerabilities bring great hidden trouble to the information transfer between aircraft and ground. The EAP (extensible authentication protocol) authentication method and security authentication mechanism based on WLAN 802.1 x/EAP is introduced.%目前飞机与地面机场之间WLAN的应用部署日益广泛，但对其安全接入通信却没有提过较为合理的设计和规划，由WLAN引起的安全漏洞给飞机与地面之间信息传递带来很大的隐患。主要介绍EAP认证方法以及基于802.1x/EAP无线局域网的安全认证机制。
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