Not sure if N900 can do it but i'm not sure why there are certain programs in the N900 repository that seem like they can crack WEP. Programs such as Aircrack-ng is very questionable because in the description field it states that it can discovery, monitor, and inject packets. I never used this on the N900 but have used commands like aircrack-ng, airodump and some others (which ill let you discover on your own) through backtrack. BTW I like the GUI on backtrack and the dragon image is cool.