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Message-ID: <158925887.3850936.1472589012830@mail.yahoo.com>
Date: Tue, 30 Aug 2016 20:30:12 +0000 (UTC)
From: Sebastian Heyn <sebastian.heyn@...oo.de>
To: <john-users@...ts.openwall.com>
Subject: Re: Which is the correct hash?
Seems like this is correct, and the idea is brilliant! Even though it did not reduce the size of the hashfile itself, the speedup is drastical.
I have to get into openmpi next. Maybe a small openmpi-enabled live cd (USB) or something.
--------------------------------------------
jfoug <jfoug@...nwall.net> schrieb am Di, 30.8.2016:
Betreff: Re: [john-users] Which is the correct hash?
An: john-users@...ts.openwall.com
Datum: Dienstag, 30. August, 2016 22:23 Uhr
On
8/30/2016 1:36 PM, magnum wrote:
>
According to Sebastian's mail this morning, the only
usable file for
> attacking is a fairly
large one (16 MB) and we may need to CRC all of
> it for each guess. That's why speed is
hit and this is what the "file
>
magic" stuff could possibly work around.
This was exactly why I created
the magic logic. Since the blob was a
.zip
file (IF the builder of the blob was not trying to confuse
us by
renaming a jgp picture into a .zip),
then the file magic would only need
to
fully decode the first 4 bytes, and then ONLY check if those
bytes
ended up being
PK\x3\x4 The magic was not noticeably faster
for tiny
files, but the larger the file
was, the more noticeable, and as the size
of file got huge, without magic, the cracking
speed simply almost crawls
to a stop.
But (and this is a big but),
we are fully assuming that we know what
the
file magic looks like. That is not always correct
(especially if
the user purposely renamed
something as more camouflage).
Was this a pkzip file, or a winzip AES
encrypted file? I though only
the pkzip
had the magic logic in it, and that the winzip method did
not
care how big the file blob was.
@magnum: is my rememberance wrong here.
Jim.
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