Hay una manera un poco mas rapida y menos "evidente" (sobre todo si andas en la calle) de sacar claves al wifi, es con un telefono android y una app llamada "Router keygen".
Suerte y felices "hacks"!!!
No es lo mismo:
http://code.google.com/p/android-thomson-key-solver/ 
Mejor bajen la app del sitio del desarrollador, las que luego distribuyen por otros medios vienen con premio
Una cosa es hallar claves por default dependiendo de ciertos datos de los routers y otra es hallar la clave WEP mediante el tutorial que publiqué.
"RRouter Keygen generate default WPA/WEP keys for the following router ( with no ads! ):
Thomson based routers ( this includes Thomson, SpeedTouch, Orange, Infinitum, BBox, DMax, BigPond, O2Wireless, Otenet, Cyta , TN_private, Blink )
DLink ( only some models )
Pirelli Discus
Eircom
Verizon FiOS ( only some routers supported)
Alice AGPF
FASTWEB Pirelli and Telsey
Huawei (some Infinitum)
Wlan_XXXX or Jazztel_XXXX
Wlan_XX ( only some are supported)
Ono ( P1XXXXXX0000X )
WlanXXXXXX, YacomXXXXXX and WifiXXXXXX
Sky V1 routers
Clubinternet.box v1 and v2
InfostradaWifi
To calculate the Thomson keys, a dictionary file is required.
Our dictionary is only a 28Mb single file, which is smaller and more efficient than anything else available on the market. This file should be downloaded by default to your SD card, though you can select the folder where the file is on the preferences menu. Alternativly we can use your Internet connection instead of the dictionary. This option can be activated in the settings menu. It also can calculate natively the key although it will take about 2 minutes in less powerfull phones and about 10 seconds on a Samsung Galaxy S. This tool also detects the new 2010 Thomson routers for which keys cannot yet be generated.
NOTICE
Telecom Italia has complained to Google about this application, and so it has been removed from the Android Market, so for now please download it from here."
Para los modems Huawei en android hay una app
https://play.google.com/store/apps/details?id=mx.websec.mac2wepkey.hhg5xx&hl=esO desde el sitio de
http://websec.mx/ puedes bajar el archivo de codigo fuente para calcular la clave WEP en Python
http://www.websec.mx/files/mac2wepkey.py