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Thread: john the ripper

  1. #1
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    john the ripper

    has anyone ever used this program?
    i'm a little confused on how to crack a password.
    you could pm me if your affraid of letting people know you actually use it.

  2. #2
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    Re:john the ripper

    Yeah, I used it. It actually did crack some easy passwords I made. But some even moderately strong ones I was too impatient to wait for.

    Easiest thing to do is give it a passwd file, a shadow file and use the unshadow utility with an output filename. Then run john outpfile. Check the docs to make sure I have that right, been a while since I ran it.

    The problem with cracking utilities, is that it relies heavily on a large word file and then runs permutations on those words. Could take very long time to crack large passwd files, so break them up in chunks.

  3. #3
    Advisor Outlaw's Avatar
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    Re:john the ripper - Quickie

    Here's a quickie how - to

    Code:
    [root@testbox root]# useradd bill
    [root@testbox root]# passwd bill
    Changing password for user bill.
    New password: things
    BAD PASSWORD: it is based on a dictionary word
    Retype new password:
    passwd: all authentication tokens updated successfully.
    [root@testbox root]# useradd chuck
    [root@testbox root]# passwd chuck
    Changing password for user chuck.
    New password: stuff
    BAD PASSWORD: it is too short
    Retype new password:
    passwd: all authentication tokens updated successfully.
    [root@testbox root]# useradd stan
    [root@testbox root]# passwd stan
    Changing password for user stan.
    New password: junk
    BAD PASSWORD: it is too short
    Retype new password:
    passwd: all authentication tokens updated successfully.
    [root@testbox root]# tail -n 3 /etc/passwd > passfile
    [root@testbox root]# tail -n 3 /etc/shadow > shdwfile
    [root@testbox root]# unshadow passfile shdwfile > johnfile
    [root@testbox root]# cd /etc
    [root@testbox etc]# john /root/johnfile
    Loaded 3 passwords with 3 different salts (FreeBSD MD5 [32/32])
    stuff            (chuck)
    junk             (stan)
    bill             (things)
    guesses: 3  time: 0:00:08:23 (3)  c/s: 1968  trying: things
    [root@testbox etc]#
    During long runs if you tap enter, john will let you know what he's doing.

    On the john website, somewhere there's a big ol' wordfile that you can specify in /etc/john.ini

  4. #4
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    Re:john the ripper

    Thanks Radar!

    I'll let you know how i made out.

  5. #5

    Re:john the ripper

    Give it a few weeks if it's a good password. Took ~2 weeks for a 7 letter alphanumeric. (Athlon XP 2100+)

  6. #6
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    Re:john the ripper

    weeks

  7. #7

    Re:john the ripper

    [quote author=diavolo link=board=14;threadid=9763;start=0#msg88776 date=1094944216]
    weeks
    [/quote]

    that's for a good password, a weak one will be minutes.

  8. #8
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    Re:john the ripper

    It took a super computer a good weeks to crack a good password. There used to be a DC project that crack passwords.

  9. #9
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    Re:john the ripper

    Soo you are telling me I should change my password from foobar?

  10. #10
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    Re:john the ripper

    Nah, just leave it blank.

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