Reaver implements a brute force attack against Wifi Protected Setup (WPS) registrar PINs in order to recover WPA/WPA2 passphrases, as described in http://sviehb.files.wordpress.com/2011/12/viehboeck_wps.pdf.

start reaver -i mon0 -b 10:FE:ED:0B:6A:A6 -vv

and wait.