You have to follow these steps:
http://www.tuto-fr.com/en/tutorial/tutoria...ep-aircrack.php [EN]
http://www.tuto-fr.com/tutoriaux/tutorial-...ep-aircrack.php [FR]
I confirm that it works well, but you'll maybe need some practice to get the WEP key in less than 1 hour
Actually I did it with 4 wifi wep access points.
Have fun
