john-users - Re: Real c/s Explaination

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Date: Thu, 23 Aug 2012 08:02:22 +0200
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: Real c/s Explaination

>From this good page:
http://openwall.info/wiki/john/mailing-list-excerpts

there are these articles:
http://www.openwall.com/lists/john-users/2009/07/25/3
http://www.openwall.com/lists/john-users/2005/09/18/2

You should also read doc/FAQ from your tree.

magnum


On 2012-08-23 06:41, NeonFlash wrote:
> Hi can anyone look into the below question and provide some details?
> 
> Thank you.
> 
> 
> 
> ________________________________ From: NeonFlash
> <psykosonik_frequenz@...oo.com> To: "john-users@...ts.openwall.com"
> <john-users@...ts.openwall.com> Sent: Wednesday, August 22, 2012 6:40
> AM Subject: [john-users] Real c/s Explaination
> 
> Hi,
> 
> I wanted to understand in depth the meaning of the c/s speed
> displayed while running an attack using JtR on a cryptographic
> hashing algorithm.
> 
> For instance, if we run:
> 
> ./john -fo=DES --test
> 
> For me it would show something like, 2300K c/s
> 
> My understanding is that my processor can perform 2300K DES
> Encryptions using descrypt of the candidate passwords in 1 second.
> However, I think this is not an accurate description. I would
> appreciate it if someone can elaborate over this (Solar Desginer
> especially :D )
> 
> Also, how is it related to the clock cycle and clock speed of a
> Processor?
> 
> For instance, if I am comparing the benchmark for the same hashing
> algorithm using the same version, build of JtR on two different
> processor, how accurate is the comparison in terms in efficiency?
> 
> I guess, cycles per byte need to be calculated for that but for this
> I need to understand the meaning of c/s in more detail.
> 
> I love JtR and I would like to understand in much more depth at code
> level.
> 
> Thank you.
>