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Date: Wed, 18 Nov 2015 20:35:39 +0000
From: Demian Smith <demian.smith@....de>
To: john-users@...ts.openwall.com
Subject: Re: Fork vs / w/ OpenMP
Thanks all,
I will just keeps sing OpenMP for now so, as the laptop is idle most of
the day and night anyway.
The custom chr is based on a likely source pdf file, so I assumed it
would give the best candidates (I have created fake pws based on the
file) but TC indeed appears really slow (263.4C/s for ripemd and
969.9C/s for aes)
I have paused my other sessions to try a new approach with a ned input
file generating the chr, in case I messed up something the first time
around... I believe the letters would also be more of the " language
based likelihood"-nature so my incremental mode looks like
[Incremental:rc3] # rules based on pdfs for truecrypt 5-12
File = $JOHN/raid2.chr
MinLen = 5
MaxLen = 12
CharCount = 20
Extra = 24
Extra 24 is as to facilitate the 2 and 4 which could be in the
passwords. I am loosing a lot of calculation, as I know the digits would
only be in place 3 and 5, if at all, but I suppose I will have to take
the hit. Not prepared to give up on my data as yet :)
Thanks for listening and your advise, guys!
Demian
★ On 15/11/18 01:07 a.m. Solar Designer wrote ★
> On Tue, Nov 17, 2015 at 10:29:58PM +0000, Demian Smith wrote:
>> Or would I be best of with running twice plain old
>> alias john2='OMP_NUM_THREADS=2 ~/.bin/JohnTheRipper/run/john
>> one time for each hash type?
>
> You may.
>
> Making a "./configure --disable-openmp" build and then using "--fork=2"
> instead of OMP_NUM_THREADS=2 will provide a slightly higher c/s rate
> (total for the two sub-processes), especially if your laptop is
> sometimes under other load (OpenMP is inefficient when the system is not
> otherwise completely idle). However, whether this slight improvement is
> worth it in your case is unclear, since you already have those old
> sessions that you probably want to continue (you won't be able to easily
> move from OpenMP to fork without starting anew).
>
> Alexander
>
--
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populates the universe.
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