Comments on: Howto Crack Rar, 7z, and zip files in Linux

By: Ditto

Ditto — Fri, 12 Feb 2010 15:12:14 +0000

Oh yeah - for those getting the seg faults (segmentation fault) try including the options in the command line
such as #rarcrack --threads 4 --type rar RARFILE.RAR

By: Ditto

Ditto — Fri, 12 Feb 2010 15:10:29 +0000

@From East - same experience here… 12 pass/sec, having trouble with “false positives” due to the ‘check password’ just being ‘unrar t -y -p%s %s 2>&1′ and this “passing” when the garbled rar file header contains the lowercase string ‘ok’ … the rarcrack program isn’t useless, but it takes some tweaking to get it to work right - and even then as noted it gives false positives and needs to be restarted each time… and as other posters have noted it can take a long long time to crack any lengthy password.

for those getting super-high rates - check that the commands such as “unrar t -y -p%s %s 2>&1″, “7z t -y -p%s %s 2>&1″, “unzip -P%s -t %s 2>&1″ where %s is a filename and a password respectively, actually work on a known file… if not - then your version of unrar, 7z, or unzip is not functioning the way rarcrack requires - meaning it is probably skipping the actual testing of the password and is only “reporting” that it tested it… thus the high speed.

By: from east

from east — Thu, 24 Dec 2009 14:04:35 +0000

I suck at programming, but this guy is even worse than me, and he managed to put that code on SF. It requires xml lib and by reviewing code I didn’t succeed to prove it doesn’t do anything evil.

So, on first run I got 180 pass/sec, my box is amd athlon 1.5ghz
ups, the problem is I hadn’t unrar and the code doesn’t check for it..
so i modified source to call /usr/bin/local/rar t -pPASSWORD file.rar
performance dropped to 12 pass/sec
what else? my rar has header in it encrypted, meaning you can’t list contents of archive.
The cracker only checks first 200 chars of response from unrar for “OK” string(case insensitive). my rar outputs garbage and says - crc is wrong, but program thinks it has recovered password, as that garbage includes OK….
plus add 12 process starts per second…….
need other open source solution that would compile on linux and windows

By: baz

baz — Thu, 24 Dec 2009 10:08:41 +0000

Had the same problem, the filename was separated with whitespace, replaced the whitespace with underscores, problem solved.

By: Marlon

Marlon — Sun, 06 Dec 2009 10:56:27 +0000

I tried it but it comes up with “Segmentation Fault”, it’s probably a n00b error but I have no idea what to do. Can anyone help?

By: georglap

georglap — Sun, 12 Jul 2009 15:04:18 +0000

It works rather pretty! But! Under 1 (absolute as life&dead) condition: installation succesfull always - but program uses its hide potential (divide processing onto 12 ways - what gives an awesome result=2000passwords/second!!!) only with x86 linux kernel. Otherwise (in a case of try to use it on x86_64) you”ll have coala speed=20pass/sec. Get rid of 64-systems. I like rarcrack for getting possibility of crackig 7z. NO ONE APSS ever & ever can”t guessing 128AES - but rarcrack! And! If you woner crack rar - use cRark3.2 with CUDA support and awesome turbospeed 1500password/second with sure final opening rar!!!

By: Misty

Misty — Wed, 27 May 2009 22:19:45 +0000

Anyone ever wonder if someone, maybe even Microsoft deep within DirectX and Windows is using background CPU and/or GPU cycles of every single PC in the world (that runs Windows) to solve some unknown problem?

By: Misty

Misty — Wed, 27 May 2009 20:02:36 +0000

Don’t know why you are getting such slow performance, I am consistently getting over 1200 passwords per second on a 2.16GHz Core 2 Duo.

My one question is, how does the program verify whether it has found a good password or not?

By: chas

chas — Wed, 27 May 2009 02:48:35 +0000

It seems to work, but is extremely slow, about 200 passwords/sec on a 3GHz CPU. It means that it will need a whole life to unscramble a simple eleven characters password.

By: Linus

Linus — Fri, 10 Apr 2009 04:27:47 +0000

You may have to compile it manually, and perhaps edit it slightly… Do you want instructions on how to do so?

By: Ian

Ian — Sat, 31 Jan 2009 16:51:06 +0000

how can I do this under OS X?

By: bijan

bijan — Tue, 13 Jan 2009 20:39:40 +0000

@Szemy- Thanks! purged unrar, installed unrar-free & working perfectly!

By: szemy

szemy — Fri, 26 Dec 2008 11:53:58 +0000

same problems as above
replaced unrar-nonfree with unrar free, works now perfectly on ubuntu 8.04.1

By: vishwanath

vishwanath — Mon, 01 Dec 2008 12:14:21 +0000

i hav install rarcrack-0.2-1.1.i586.rpm and not able to crack locked rar files…….
when i execute the command
#rarcrack sample.rar
it is showing output and creating the xml file
but i m not ablr to open file
its displaying
RarCrack! 0.2 by David Zoltan Kedves (kedazo@gmail.com)

INFO: detected file type: rar
INFO: cracking sample.rar, status file: sample.rar.xml
GOOD: password cracked: ‘1?
GOOD: password cracked: ‘0?

and xml file contents is

0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
2
0

By: MintThing

MintThing — Thu, 27 Nov 2008 22:13:09 +0000

@Dirk:Share it then. (I also invented an airplane=)

By: dirk

dirk — Tue, 25 Nov 2008 09:01:39 +0000

looking at the source code, it’s incredible that people are using this. it just calls the unrar binary repeatedly. i wrote a perl script in 5 minutes that performs faster and uses a dictionary.

By: Merc

Merc — Wed, 22 Oct 2008 09:55:13 +0000

Of course, brute force can sometimes useful but in most cases it’s not (the same for this program approach).

On my 1.6Mhz/512MB it’s an average of 50pass/sec which means 180.000 password/h. Pretty impressive but…

Let’s consider we have 62 digits to try (A-Za-z = 52, 0-9 = 10). This means

2 digits pass = 62 * 62 = 3844 possible combinations
3 digits pass = 62^3 = 246.016 possible combinations
…
and for a simple 5 digits pass means 62^5 = 916.132.832 combinations.

How take this number, divide it by 180k pass/h and we’ll have more than 5000h ~ 212 days of non stop trying. Put a 8 character password and you’ll end up with a lifetime.

A more friendly approach (I saw it long time ago) was to remove the password from the file and modify the file flag to nonpass situation, but I’m not quite sure if it’s still working.

By: Belete

Belete — Fri, 17 Oct 2008 12:31:25 +0000

i forget it my zip folder file help me when i get my password or breaker it and the folder has four file

By: George

George — Sat, 27 Sep 2008 02:47:12 +0000

I tested rarcrack but failed.
A file (a.txt) was crypted by WinRAR 3.5 with password ‘aa’. The encrypted file is a.rar.

./rarcrack a.rar
RarCrack! 0.2 by David Zoltan Kedves (kedazo@gmail.com)

INFO: detected file type: rar
INFO: cracking a.rar, status file: a.rar.xml
Probing: ‘p8′ [539 pwds/sec]

it didn’t found ‘aa’.

George

By: H

Tue, 12 Aug 2008 00:27:20 +0000

how if the file is a exe that was a rar ? exe with password.
please help