Wep0ff – Wireless WEP Key Cracker Tool

Keep on Guard!

Wep0ff is new WEP Key Cracker that can function without access to AP, it works by mounting a fake access point attack against WEP-based wireless clients.

Wep0ff - Wireless WEP Key Cracker Tool

It uses a combination of fragmentation and evil twin attacks to generate traffic which can be used for KoreK-style WEP-key recovery.

This tool can be used to mount fake access point attack against WEP-based wireless clients.

This code tested patched madwifi-old drivers with athraw support but also works with madwifi-ng. With madwifi-ng you need to create two virtual interfaces: one in master mode (for fake AP) and second in monitor mode (to listen on).

What is WEP Cracking?

Wired Equivalent Privacy (WEP) is a security algorithm for IEEE 802.11 wireless networks. Introduced as part of the original 802.11 standard ratified in 1997, its intention was to provide data confidentiality comparable to that of a traditional wired network.

It’s fairly easy to crack WEP due to flaws in the algorithm if you are setting up your WiFi network you should opt for WPA.

How to Use the WEP Key Cracker Tool

1. Setup fake AP with KARMA tools or iwconfig

2. Start this program (./wep0ff ath0raw 00:01:02:03:04:05)
3. Wait until client connect to fake access point
4. Launch airodump-ng to collect packets
5. Launch aircrack-ng to recover WEP key

You can download it here:


Posted in: Hacking Tools, Networking Hacking, Wireless Hacking

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19 Responses to Wep0ff – Wireless WEP Key Cracker Tool

  1. jimmy February 7, 2007 at 11:01 pm #

    hi what os is this used on?

  2. Gouki February 8, 2007 at 3:09 am #


  3. DotSlashZero June 1, 2007 at 9:20 pm #

    Can it be used on Cygwin?
    i have a fedora in another computer but i’d do better in my laptop in which i only have cygwin… i gess i’d have to install a lot of software huh?
    like iwconfig or something?

  4. Darknet June 3, 2007 at 9:41 am #

    DotSlashZero: I don’t tend to use tools like this on Cygwin as they require native driver support, which windows doesn’t give. I would suggest setting up a VMWare image of a Linux install or just use a liveCD like Backtrack to access tools like this.

  5. DotSlashZero June 3, 2007 at 1:13 pm #

    VMWare image of a Linux? is that like a virtual linux within windows? i have a linux version called DSL Damn Small Linux and i think it does that… am i right?

  6. Chris November 29, 2007 at 5:12 pm #

    What of a Wepkey crack for windows?

  7. yogesh April 19, 2008 at 8:41 pm #


  8. Hyper April 29, 2008 at 2:19 pm #

    Does these tools (airodump-ng, KARMA tools or iwconfig,aircrack-ng) work with all wireless cards. Because i have tried some other tools before and had to be atheros wireless card (something like this)

  9. bob July 27, 2008 at 2:59 am #

    hey dudes once you have a wep key how do you recover the original password from that

  10. shakezz August 6, 2008 at 7:54 am #

    i have a windows vista laptop and no wep hack programs seem to be compatible, can somebody suggest one.

  11. winx August 15, 2008 at 1:35 pm #

    most tools like this tend to require specific wifi cards (usb afaik just aint good enough) with specific chips atheros and prisim chips are (to my knowledge) the most widely used. look hard enough and you’ll find which ones are compatible with wep cracking tools

  12. sunny August 28, 2008 at 7:05 pm #

    i want this software comfortabe for win vista and wireless (dell wireless 1395 wlan mini card)

  13. maysiool December 5, 2008 at 9:25 pm #

    nice and good for everybody

  14. k-ryder December 9, 2008 at 10:11 pm #

    i have toshiba satellite laptop with Vista premium. will this program work on my pc or do i have to get another cpu like my IBM

  15. wepkey December 23, 2008 at 1:06 am #

    hey men so how could we get this baby working im using windows vista your help is much appriciated thankx

  16. navin December 23, 2008 at 12:50 pm #

    people ought to learn to read!! Dear Mr. wepkey, Wep0ff runs on the Linux OS, and does not run on the Windows Vista OS

    As such U need to either, a) install linux on your comp/lappy
    b)use a live CD (Backtrack is recommended by most L337 h@xors)
    c)Create a virtual drive using a tool like wubi (for ubuntu) on your system and install and run Linux off it

    Using these steps you can , as you put it, “get this baby working”

    n00b <– That my friend, is a complement of the highest order for people like U!! ;)

  17. Bogwitch December 23, 2008 at 2:00 pm #

    Heh – I thought all the morons asking for Vista versions were trolling.

    That’s the Interwebs for ya!

  18. avinash March 27, 2009 at 8:24 am #

    which type of file or softwar .tar

  19. 3p1c April 7, 2009 at 6:17 pm #

    i’ve got a toshiba satellite with a 802.11a/g/n wireless, i been obtaining a few connections locally, i was wondering if you could help :D