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. by Stefan Viehböck.
Reaver has been designed to be a robust and practical attack against Wi-Fi Protected Setup (WPS) registrar PINs in order to recover WPA/WPA2 passphrases and has been tested against a wide variety of access points and WPS implementations.
The first version of reaver-wps (reaver 1.0) was created by Craig Heffner in 2011.
reaver-wps-fork-t6x version 1.6.x is a community forked version which includes various bug fixes, new features and additional attack method (such as the offline Pixie Dust attack).