Any sort of layer 3 and above man-in-the-middle attack you could possibly imagine will be possible if you are using a wireless access point without any encryption. So you should operate under the assumption that anything and everything you access from there cannot be trusted. Be afraid, be very afraid....
Or you could save yourself a headache and get your brother to turn on WPA2 encryption. He should be able to get an XBOX compatible wireless connector that will work with this. If you don't have it on you're just asking for trouble, especially when it seems as though you live in a neighborhood full of douchebags trying to hack you.





