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Thread: Creating rules in Crunch

  1. #1
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    Default Creating rules in Crunch

    Hi guys,

    so part of my pen testing for a client i would like to show him that the default 8 char WPA password they are using is really easy to crack.

    i have identified a trend in the WPA keys their ISP is offering from previous clients which is something like

    first four characters are numbers
    - the remaining 4 characters are a mixture of capital letter (A-F) and numbers (0-9)
    - the second part cannot be only numbers or only characters it should always be a mixture of both

    i got the WPA handshake saved in a file and ive been trying to crack it. I cracked it in about 15 hours but thats too long

    my current command is ./crunch 8 8 0123456789ABCDEF | aircrack-ng -w- -b (ssid of the target) crackfile.cap

    sorry if there is a mistake in the above command but i entered the correct one if the shell

    anyhow i would like to customize the command in crunch in order to

    - first four characters are numbers ( this can have the same numbers in line i.e 0022)
    - second part to be a mixture of capital letters and numbers

    I believe this method will reduce the time a lot.

    can anyone shed some light here?

    thank you

  2. #2
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    Default Re: Creating rules in Crunch

    Have a look at this link;

    http://adaywithtape.blogspot.com/201...runch-v23.html

    TAPE did a good write up on how to use Crunch, hopefully that'll be able to help you out.
    Last edited by Jimmy87; 01-07-2011 at 01:44 PM. Reason: posted link twice

  3. #3
    Very good friend of the forum TAPE's Avatar
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    Default Re: Creating rules in Crunch

    Try the below ;

    Code:
    ./crunch 8 8 0123456789ABCDEF -t %%%%@@@@

  4. #4
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    Default Re: Creating rules in Crunch

    Quote Originally Posted by Jimmy87 View Post
    Have a look at this link;

    http://adaywithtape.blogspot.com/201...runch-v23.html

    TAPE did a good write up on how to use Crunch, hopefully that'll be able to help you out.
    Yes Tape's write up is really good and breaks it down into easy to understand crunch size bytes
    Anyway, how long on average and what size file would it take to create an 8 character passphrase all caps ? I'm trying to figure out of the lenght of time is worth the effort. thanks

  5. #5
    Very good friend of the forum TAPE's Avatar
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    Default Re: Creating rules in Crunch

    I wrote a post on wordlist sizes on the same blog, have a look at that as well.
    It sounds like an easy wordlist right... ? wrong..

    Number of passphrases that would be generated; 208827064576

    Estimated size of that wordlist; 1750.368GB

    How long would that take on your system ? No idea.. Crunch will however now also show how many percent you have done (with version 2.7 that is) so have a shot.


    When using the latest version of crunch, prior to starting the creation of the wordlist, it will
    show you what the estimated size of the wordlist will be.

  6. #6
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    Default Re: Creating rules in Crunch

    Thanks for the reply tape, both the blogs i have read of yours are spot on.

    This is off topic but will ask you anyway - if using pyrit in passthrough mode is it necessary to have a full wordlist located on harddisk . According to Purehate's document it seems to imply that its not necessary or maybe i read this wrong and am not distingushing between the hash's and the dictionary file.

    I am new to BT but fascinated by it and all the tools available so apol's if this is a bit of a silly question. good luck

  7. #7
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    Default Re: Creating rules in Crunch

    This is getting slightly waaay off-topic

    But which post from Purehate are you referring to ? I have never tried pyrit to be honest as
    I usually do the tests just for fun on either a netbook or VM image.. neither designed to be
    high speed crackers..

  8. #8
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    Default Re: Creating rules in Crunch



    It was the "how to" pdf on Cuda which purehate wrote, really good too.
    I just asked yourself as you seem to be pretty patient with us novices.

    Thanks anyway amd all the best, i will read some more.

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