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Message-ID: <CA+TsHUCWui7m6UkKHKHp+JDDydYfEbzLedd_fPXfTQC9VN3sdg@mail.gmail.com>
Date: Sun, 8 Jul 2012 07:58:06 +0530
From: Sayantan Datta <std2048@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: optimized mscash2-opencl
On Sun, Jul 8, 2012 at 1:32 AM, Frank Dittrich
<frank_dittrich@...mail.com>wrote:
> On 07/07/2012 11:48 AM, Solar Designer wrote:
> > I did not check for possible false negatives. Someone will need to run
> > the test suite.
> >
> > Also notice how we stayed within the same "bara - choedia" set of
> > candidate passwords for half an hour. It'd take roughly:
> >
> > 262144*1090/102413 = 2790 seconds
>
> For the test suite, we also need to make sure the number of passwords in
> the (possibly format specific) pw.dic is higher than MAX_KEYS_PER_CRYPT
> (here: 262144), possibly even higher than 2*MAX_KEYS_PER_CRYPT.
> Otherwise we will miss several sorts of possible bugs.
>
> Frank
>
>
Changing the MAX_KEYS_PER_CRYPT to 1/2x or even 1/4x has minor impact on
performance. Performance decrease is less than 1% and 2% for 1/2 and 1/4th
MAX_KEYS_PER_CRYPT respectively.
Sayantan
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