With the appearance of high speed WPA/WPA-PSK brute forcer, the security of WLAN faces serious threats. The attackers can acquire PSK easily so as to decrypt all the traffics. To solve this problem, a series of defence schemes are proposed, including defence schemes for passive and active brute forcers. The schemes adopt active jammer and wireless packet injection. And then the theoretical analysis is processed and the implementation methods are given. In the last past, the conclusions are reached.
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