Hallo guys! I wanna add my opinion, Kismet is the best software in my opinion to brake wep keys or other type of encryption. Is a software working on Linux, i used Kismet for a couple of time and i still use it.Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic.