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Date: Tue, 30 Aug 2016 07:59:06 +0000 (UTC)
From: Sebastian Heyn <sebastian.heyn@...oo.de>
To: <john-users@...ts.openwall.com>
Subject: Re: Which is the correct hash?
The file has a weird structure.
backup.zip <- password encrypted
ver 1.0 Pic.zip->Neu Textdatei.txt PKZIP Encr: cmplen=12, decmplen=0, crc=0
ver 1.0 Pic.zip->bilder.zip PKZIP Encr: cmplen=16969698, decmplen=16969686, crc=7F501B9D <- the file itself is also password encrypted
and zip2john doesn't seem to know the -m option. Do I need to enable anything when configuring it?
./zip2john -m ../../Backup.zip >backup.hash
./zip2john: invalid option -- 'm'
--------------------------------------------
magnum <john.magnum@...hmail.com> schrieb am Mo, 29.8.2016:
Betreff: Re: [john-users] Which is the correct hash?
An: john-users@...ts.openwall.com
Datum: Montag, 29. August, 2016 22:37 Uhr
On 2016-08-29 21:00,
Sebastian Heyn wrote:
> I'm trying to
bruteforce an old backup.zip file that i found after over 10
years and I wanted to have a look at. Now I obviously forgot
the password.
> My problem is that with
john-1.7.9 (gentoo) the zip2john script gives a pkzip hash
which is a 92 byte file ($PKZIP$). However when I use
jumbo-john from git, zip2john gives a
>
32mb hashfile containing a $PKZIP2 hash. which is the
correct one? is there any known bugs in either version?
>
> -> the pkzip hash
brutes at 19k/sec
> -> the pkzip2 hash
brutes at 100/sec (--fork=32 gives x32 speed)
>
> any idea which is
correct hash to brute force?
Generic answer: Obviously the newer version.
The 1.7.9 version is so
very old you
shouldn't use it other than for curious comparisons. I
can't even recall all changes to this
format but some serious issues
have been
addressed, and quite possibly some performance
improvements.
A more
specific answer for your case is that the difference in
speed you
mention MAY be due to the older
version defaulting to "file magic"
whereas the newer does not. Does this zip file
contains just one (or
few) large file and
no small ones? You can use -m as in "zip2john -m
backup.zip > OUTFILE" to enable file
magic and see where that gets you.
Just
beware that resorting to file magic can be error prone (you
might
end up with false negatives) and that
is why we don't default to it anymore.
magnum
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