reaver -i <interface> -b <target bssid> -vv
Reaver implements a brute force attack against WiFi Protected Setup which can crack the WPS pin of an access point in a matter of hours and subsequently recover the WPA/WPA2 passphrase.
Specifically, Reaver targets the registrar functionality of WPS, which is flawed in that it only takes 11,000 attempts to guess the correct WPS pin in order to become a WPS registrar. Once registred as a registrar with the access point, the access point will give you the WPA passphrase.
This manual page was written by Craig Heffner <firstname.lastname@example.org>, Tactical Network Solutions. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.