Solution Solution Overview. The objective is to capture the WPA/WPA2 authentication handshake and then use aircrack-ng to crack the pre-shared key. This can be done either actively or passively. What is Aircrack-ng? Aircrack-ng is a network hacking tool that consists of a packet sniffer, detector, WPA/WPA2-PSK cracker, WEP and an analysis tool for for 802.11 wireless LANs.
You normally don't need more than 300000 ivs to find a wep key in general. Regardless of how often the wireless network is used, an injection attack will make the process much faster. You aren't just capturing every packet your card picks up on. You need initialization vectors. Even with a heavily used wireless network, gathering a workable amount of ivs can take hours. With aireplay you can just forge arp requests and the router spews packets with ivs.