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Date: Sun, 15 Jan 2006 17:49:43 +0300
From: Solar Designer <>
Subject: Re:  Re: JtR 1.7 release candidate

On Sun, Jan 15, 2006 at 12:03:12PM +0000, Phantom wrote:
> A question, why is therre no john.conf file in your win and dos builds?

There's john.ini instead.  john.conf is a more natural name for Unix
systems, but it wouldn't work on 8.3 filesystems (old-fashioned FAT)
and with DOS versions of PKUNZIP.

> Did a test run on 5303 DES hashes and compared 1.7 Win-mmx with 1.7 DOS-mmx,

I'd be interested in your comparing the results against those of 1.6.
Of course, 1.7 will be a lot faster, but the test would be to make sure
that 1.7 cracks all the same passwords that 1.6 did.

> The DOS-mmx was considerably slower (tested in commandprompt windows in
> XP..dunno if that affected the speed of the DOS one?)

Yes, the DOS build should run a little bit faster on plain DOS.  But the
difference should be much smaller than what you have observed in the
second test:

> DOS> guesses: 205  time: 0:00:00:04 100%  c/s: 8686K (default single rules)
> WIN> guesses: 205  time: 0:00:00:03 100%  c/s: 12891K (default single rules)

This is OK, no real difference.

> then ran my own -single rules afterwards:
> DOS> guesses: 393  time: 0:00:09:29 100%  c/s: 6479K (my single rules)
> WIN> guesses: 393  time: 0:00:05:58 100%  c/s: 10282K (my single rules)

Perhaps you had a lot of rules (after preprocessor expansion), so the
log file was being written at a fast rate and that has slowed things
down for the DOS build (file accesses are a lot slower with DJGPP).  How
large was the log file after these runs?

Can you share your custom "single crack" rules with us?

If you really want to compare the performance of these builds, consider
running them in "incremental" mode for some hours.


Alexander Peslyak <solar at>
GPG key ID: B35D3598  fp: 6429 0D7E F130 C13E C929  6447 73C3 A290 B35D 3598 - bringing security into open computing environments

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