You might have read the previous tutorial about cracking wep with backtrack 3. In this article, you will find another wifi hacking method which is still related to wep cracking. Nowadays almost all of wireless hotspots use WPA as the authentication. To clearly understand about the difference between WEP and WPA, you can read this article. Instead of writing comple tutorial to crack WPA with backtrack 3, I’m just gonna show you the cracking WPA with Backtrack 3 video taken from Metacafe 
Enjoy!
Related articles :
- How to Crack a Wi-Fi Network’s WEP Password with BackTrack [Wi-Fi] (lifehacker.com)
- How do I secure my home Wi-fi network? (cnn.com)
- Wireless Lan Security (slideshare.net)