can someone please explain to me how aircrack works?
i run the command and it successfully decrypts it but then what? where do i go from there? please help!
The app isn't fully functional. You first need to capture enough packets and and do a whole bunch of other stuff that I'm not gonna get into and am not even sure if the iPod Touch/iPhone is capable of doing. You'll need to get to know how to use aircrack on a Linux-based laptop (Since it's the only OS without the security checks that work against aircrack). The iPod app provides very little convenience compared to the Linux suite. I think it's just a proof-of-concept thing.
Besides, even if the iPod had a fully funcitonal aircrack app, with packet capturing and everything, it would drain up your battery faster than mobilesafari on 1.1.0 firmware.