Answer Posted / chaitanya

To efficiently crack a WEP key, you first need to obtain an Address Resolution Protocol (ARP) packet from the access point you want to attack. You can obtain this packet using a tool such as Void11 (www.wlsec.net/void11) to send deauthentication packets to the clients associated with that access point. When the clients reassociate to the access point, ARP packets will be generated and can be captured. After you have captured a valid ARP packet, you can use a tool such as Aireplay, a part of the Aircrack suite (http://freshmeat.net/projects/aircrack/), to inject the ARP packet back into the network. This injection process will cause a large number

of initialization vectors to be generated. You can capture this traffic with any pcap format sniffer. Ethereal, Airodump, and Kismet all support pcap format. After you have captured between 500,000 and 1 million unique initialization vectors, you can then crack the WEP key using Aircrack or other, similar tools. Most of these tools are available for free on the Internet.

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