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Thread: BackTrack/WEP cracking newbie in need of help

  1. #1
    Just burned his ISO
    Join Date
    May 2010

    Default BackTrack/WEP cracking newbie in need of help

    Hey guys. New member of the forums and relatively new user of Linux(Kubuntu flavor).

    I have heard a ton about how "easy" it is to crack WEP networks. After hearing this I figured I would try and test this out on my personal router(Linksys Wireless-G Broadband Router). I found a how-to off of and started trying.

    However after numerous attempts and hours of searching for answers I have not succeeded. I am pretty sure I am doing everything right however it still does not seem to be working.

    Airodump-ng is collecting data(same thing as IV's?) but however only when I am stimulating network traffic on either my computer(the same one performing the hack, or my roommates computer)

    I have associated myself with the AP using the Aireplay-ng -1 attack(Even though it takes a while to associate with the AP)

    Aireplay-ng -3 attack works however only about 1/5 of the time it is able to collect any ARP's. Even if it does it does not seem to increase IV's at all. Also some of the time it reaches a certain number of ARP's and suddenly stops(even though the sent packets keeps increasing).

    I have messed around somewhat with Aireplay-ng's -2 and -5 attacks but I'm really not sure what I'm doing with those.

    The standard interface that my computer uses is wlan0 and when I restart it with airmon-ng it enables monitor mode on mon0. I have noticed something peculiar when I run ifconfig mon0 however.
    root@jonzo-laptop:/home/jonzo# ifconfig mon0
    mon0      Link encap:UNSPEC  HWaddr 00-1F-3B-D3-C5-D1-00-00-00-00-00-00-00-00-00-00  
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:787 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:86250 (86.2 KB)  TX bytes:0 (0.0 B)
    When specifying my mac I only use 00-1F-3B-D3-C5-D1 even though I have no idea what all the other 0's are for.

    When I try to use Aircrack-ng to find the wep it always fails and tells me to find IV's. I have also tried the -K attack in aircrack(I'm assuming this is more of a brute force attack?) with no success.

    I first started trying to do this on a 128-bit WEP but realised I might as well try to start on a 64-bit but even after I switched my network to a 64-bit I still haven't been able to crack it.

    Can anybody help me out with this? I would love to figure out what I'm doing wrong and finally get that damn wep key.

    If you guys need any more info I will be glad to provide it.

  2. #2
    Join Date
    Feb 2010

    Default Re: BackTrack/WEP cracking newbie in need of help

    There has to be a traffic for you to be able to capture IVs.Simply get another laptop and connect it to your router,do some network activity.Then use another machine for running airodump-ng and all this stuff.
    Aireplay-ng -4 and -5 are attacks you can use when there is no client connected to AP, which is your case i assume.
    ,, It's the flower of light in the field of darkness that's giving me the strength to carry on.,,
    Eli says:,,No, it's, uh, Johnny Cash, Live at Folsom Prison,,

  3. #3
    Junior Member skidmarq's Avatar
    Join Date
    Jan 2010

    Default Re: BackTrack/WEP cracking newbie in need of help

    Use a second PC on the wireless network to do an ARP scan...
    I got 99 problems but the bits ain't one...

  4. #4
    Just burned his ISO
    Join Date
    May 2010

    Default Re: BackTrack/WEP cracking newbie in need of help

    thanks for the help ^^ but I don't have another computer at hand that is able to run airodump or inject packets. I also feel like a dick trying to take other peoples computers just to test them out with a BT cd.

    Anyway new developments. I just tried the aireplay-ng 9 attack to see if my card can inject packets and found out that it indeed can't. I find this strange though because I have been able to get ARP's in the past.

    Airodump-ng seems to still be working however and collecting packets when there is network traffic. As we speak airodump is still collecting packets and I have had no success cracking my network. I last tried it with 270,000 IV's but still have had no luck cracking the 64 bit network.

    Even though I can't inject packets I still should be able to crack the key if I have enough IV's right?

  5. #5
    Very good friend of the forum killadaninja's Avatar
    Join Date
    Oct 2007
    London, United Kingdom.

    Default Re: BackTrack/WEP cracking newbie in need of help

    Check here.
    Last edited by killadaninja; 05-05-2010 at 08:48 AM.
    Sometimes I try to fit a 16-character string into an 8–byte space, on purpose.

  6. #6
    Just burned his ISO
    Join Date
    Feb 2010

    Default Re: BackTrack/WEP cracking newbie in need of help

    Are you the only station/machine inside the network? if you can have another station/machine connect to the AP, try deauth the station/machine to increase the rate. Else you have to use chop chop or fragmented attack.
    I am not quite understand the problem you are facing now, could you explain a little bit more?
    Also, following those tutorials makes you know how to use the tools, but not understand the theory behind. Do some google search.

  7. #7
    Moderator fancy's Avatar
    Join Date
    Jan 2010

    Default Re: BackTrack/WEP cracking newbie in need of help

    And once again, PLEASE USE MORE DESCRIPTIVE TITLES for your thread.

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