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Along with the wireless network application daily popularization, itssecurity problem also more and more prominent, the wireless networkand the wired network are different, theoretically in the radio wavescope any computer all may monitor and register the wireless network.If the internal network security measure insufficiently is strict,then completely has the possibility to intercept, the browsing evenoperates the email. In order to cause to be authorized the computer tobe allowed to visit the network but the illegal user to be unable tointercept the network correspondence, the wireless network securityappears very important. This also proposed for the wireless networkresearch the new task, begins from the analysis wireless networkstructure, mainly discussed the wireless network existence non-authorized visit, the information has been easily stolen, is usurped,is disturbed and so on the security hidden danger, as well as solvedthese hidden dangers main technologies