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Thread: Inability to crack WEP - WRT54G

  1. #1
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    Default Inability to crack WEP - WRT54G

    I just got my Alfa AWUS036H in the mail. Booted backtrack 4 from livecd.

    Followed this guide: http://lifehacker.com/5305094/how-to...with-backtrack

    I can get connected and send data and acquire the packets but I'm unable to crack the key.. I'm on my own WRT54G router (Version 2 if it matters) with a 64 bit key and cannot crack the key it seems.. is that guide missing something?

    I cannot authenticate on the network, for example, unless I use mon0 as opposed to wlan0

  2. #2
    Moderator KMDave's Avatar
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    Default Re: Inability to crack WEP - WRT54G

    Well your wifi device might have a different name than wlan0.
    So just check if that is the case then you can go ahead and use the correct device name.
    Tiocfaidh ár lá

  3. #3
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    Default Re: Inability to crack WEP - WRT54G

    I got the device name from running airmon-ng from terminal

  4. #4
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    Default Re: Inability to crack WEP - WRT54G

    check out your ifconfig. it should give you the name of your device. my onboard is wlan0 and my alpha is wlan1. I'm looking at the lifehacker article you used as a tutorial and once you use airmon it will rename the interface mon0.

  5. #5
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    Default Re: Inability to crack WEP - WRT54G

    I would say I am well versed in this subject. Could you please paste every command you have typed in? Also provide the output of the list of available networks after you enter the command "airodump-ng (interface)."

  6. #6
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    Default Re: Inability to crack WEP - WRT54G

    Hello, I had many struggles getting mine to work as well. First you want to make sure that your wireless card can inject. Follow this guide to test it.

    http://www.aircrack-ng.org/doku.php?id=simple_wep_crack

    Second I only use mon0, that works for me. I'm sure there can be other situations as I see people talk about an ath0 and wlan0.

    And again, this is merely from personal experience (and it could be because I was doing something wrong). I couldn't get macchanger to work. Instead where I needed "-h" I used the station for my network. I've only ever done it (quite a few times to make sure I got it right) on my home network, so asking if your specific router can be cracked I don't know for certain, but I assume so cause I figure a WEP is a WEP and it doesn't matter where it comes from.

  7. #7
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    Default Re: Inability to crack WEP - WRT54G

    instead of 10000 packets like most say sometimes you need up and past 50000.

  8. #8
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    Default Re: Inability to crack WEP - WRT54G

    When you say you are unable to crack the key, I assume you mean you are not capturing enough IV's. Aircrack-ng chews through WEP keys faster than a fat kid in a candy store so I doubt that's your issue. When you run Aircrack it should tell you how many IVs it is using to "guess" the key. What's your say?

    I hate suggesting this, but have you tried using any of the programs included with Backtrack to automate the process? This would allow you to identify if it's the commands you are entering that is causing the problem or if it's the AP that's the issue.

  9. #9
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    Default Re: Inability to crack WEP - WRT54G

    Assuming you have made it as far in the cracking process that you have successfully authenticated with the client, are able to inject and are collecting IVs; I would have to agree that you have not collected enough information while running Airodump.

    I've experienced a few cracks that required 80,000+ data to crack 64bit.

    As far as the router you are attacking goes, WRT54Gs are cake

    Hope this helps!

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