Here’s a video showing you how to crack Wireless WEP keys using Backtrack 4 and aircrack-ng.

Additionally, you need a compatible wireless adapter or compatible wireless chipset which can be used with aircrack-ng.

Here are the list of the best wireless cards to use(according to aircrack-ng wiki):

• Alfa AWUS036H [b/g USB] 1W 802.11b/g USB Wireless WiFi Network Adapter
• Ubiquiti SRC 802.11a/b/g PCMCIA Cardbus
• Cisco Aironet 350 Adapter ( AIR-PCM352 )

Good luck!

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