Comments on: Linux Password Cracking: Explain unshadow and john commands ( john the ripper tool )

By: Kataklysmos

Kataklysmos — Thu, 09 Feb 2012 11:01:35 +0000

I had the same problem (Debian squeeze), too. So I uninstalled “john” and “john-data” via apt-get and compiled it by myself. Now it is running wonderful!

@VIVEK: Thank you for this short but detailed article.

By: JD

JD — Wed, 14 Dec 2011 19:21:02 +0000

Just saved me a lot of time!

‘Hats off to John the Ripper’!!!

By: jenkinbr

jenkinbr — Sun, 04 Dec 2011 05:31:51 +0000

Did you try installing from source? I had the same issue with the ubuntu binaries.

By: wrongname

wrongname — Tue, 30 Aug 2011 10:59:45 +0000

hello sir,
I forgot my ubuntu password so please help me. here no service center.

By: webuser

webuser — Fri, 01 Jul 2011 06:37:21 +0000

EPIC FAIL in ubuntu 11.04

By: Baby

Baby — Thu, 16 Jun 2011 14:30:32 +0000

me too!!

By: jizzle

jizzle — Wed, 25 May 2011 19:16:27 +0000

hey jabronis, this will work on strong passwords. it has a brute force mode which checks all possible combinations, you just have to be patient :p

By: fub

fub — Sat, 07 May 2011 16:04:41 +0000

I hav a problm when making a copy:
cp /etc/passwd > passwd.1—>cp: opérande du fichier cible manquant après `/etc/passwd’
Pour en savoir davantage, faites: « cp –help ».
Can someone help me!thank

By: sanjay kumar verma

sanjay kumar verma — Mon, 21 Feb 2011 06:16:45 +0000

Hello
dear….
how to break password of root in Rhel 6.0
Thanks

By: Ashwin Hegde

Ashwin Hegde — Tue, 11 Jan 2011 13:38:14 +0000

Nice Application;

By: bqcot

bqcot — Mon, 13 Dec 2010 18:12:24 +0000

nice for dumies.. I’ll try :)

By: unp

unp — Wed, 29 Sep 2010 01:11:02 +0000

N0x ye be right:
~$ john /tmp/crack.password.db
No password hashes loaded

By: bo

bo — Mon, 24 May 2010 15:57:24 +0000

sounds like phone numbers in the tel-aviv (israel) area codes :)

By: N0x

N0x — Tue, 16 Feb 2010 17:45:00 +0000

I don’t think JTR is compatible with the new SHA512 encryption on most Linux distributions…

By: fotis

fotis — Fri, 25 Dec 2009 23:41:31 +0000

really helpfull. thanks

By: kalidoss

kalidoss — Wed, 05 Aug 2009 09:57:11 +0000

Hi, this is working to crack the week passwords only, I can’t crack my root password; how to crack touch passwords. If anybody know the solution, please mail me.

kalidosstvr@yahoo.in

By: smith

smith — Mon, 13 Jul 2009 15:16:27 +0000

I have recentaly accured some passwods and am in need of a nother there are 3 computers that anr pertected by passwords I have 2 of them but the last one evades me for computer 2 the password is 036915307. for computer3 the password is036915364.
i need the passwoed for computer1 the pass words goes 0369152 I could not figure out the res if some one would help i would appreat it.
smith

By: Ajit

Ajit — Thu, 04 Jun 2009 11:09:00 +0000

a simple steap is linux passwd

By: Ashwani

Ashwani — Mon, 30 Mar 2009 15:19:12 +0000

Well i can say its simply doesnt work on tough passwords it works only on simple text passwords i dont know y this package got so…much of popularity

By: Anant Bhasu

Anant Bhasu — Mon, 26 May 2008 08:49:06 +0000

Always take care that you dont alter the file permissions for the /etc/shadow file, which by default is “-r——–” read only for root(This is definetly true for CentOS and FC,am not sure about the rest). If the read permissions are set for the user for /etc/shadow, a non root user may be able to execute john to retrieve passwords for root as well as other users on that system. Overall this system can then be viable to remote attacks via pre installed back door user accounts.