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Message-ID: <20131101091349.GA4720@openwall.com>
Date: Fri, 1 Nov 2013 13:13:49 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Fwd: pdf password cracking with john
On Fri, Nov 01, 2013 at 08:43:24AM +0530, Akshar Kanak wrote:
> I am trying to recover password from PDF . Looks like john (jumbo latest
> version)
> is not supporting multiprocessing for pdf password cracking .
If by "latest version" you mean the latest numbered release, then yes -
1.7.9-jumbo-7 did not have OpenMP parallelization for PDF yet. Here's a
list of OpenMP-enabled formats in the (older) jumbo versions:
http://openwall.info/wiki/john/parallelization#Built-in-parallelization-with-OpenMP
OpenMP parallelization for PDF is present (at least) in bleeding-jumbo:
https://github.com/magnumripper/JohnTheRipper/tarball/bleeding-jumbo
[solar@...er run]$ ./john -te -form=pdf
Will run 32 OpenMP threads
Benchmarking: PDF [MD5 SHA2 RC4/AES 32/64]... (32xOMP) DONE
Many salts: 1112K c/s real, 34784 c/s virtual
Only one salt: 1085K c/s real, 33973 c/s virtual
Note that in bleeding-jumbo you may also use --fork. Try both approaches
and use whichever works better for you.
> I used the following format .
> 1) Used pdf2john to get the format which john can under stand.
> 2) Then did export OMP_NUM_THREADS=4
> 3) Then executed john on the format .
>
> when I try to find out the number of john threads which are getting
> executed using the ps command , it shows only one .
Note that you need to build JtR with OpenMP support (uncomment the
OMPFLAGS line in the Makefile, as the README says), but you usually
do not need to specify OMP_NUM_THREADS (except e.g. on Solaris).
Alexander
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