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Date: Sat, 20 Feb 2016 18:04:49 +0100
From: Philipp Teister <>
Subject: Re: Cracking zip files

Hi Alex,

ZIP is actually broken and can be brute-forced with a proper dictionary.
I tested it with a custom zip pwd cracker, it returned mulitple solutions (pwds) for one zip archive.

You can write something like this yourself, for example: I used not more than 15 lines in python

I am sry if this answer is a bit off-topic(JTR-wise) but nonetheless this solution worked for me many times

best -Philipp

> On 20 Feb 2016, at 17:03, Alex <> wrote:
> Hi,
> I'm using john-1.7.9-jumbo-8-RC_omp on fedora22 on an x86_64 desktop
> and have a zip file with two CSV files in it that I need to access.
> After creating the shadow entry with zip2john, I start to crack the
> password. However, it just keeps printing "possible" passwords, none
> of which appear to work. Is there a point where it prints the actual
> password? Or do I need to continually try those which it *thinks* are
> the passwords?
> It also shows there was one hash cracked when using --show, it doesn't work:
> [alex@...x-pc ~]$ john --show zipfile.john
> 1 password hash cracked, 0 left
> How long is the typical time it takes to crack a zip password at about
> 8k c/s? Should I expect several days with current hardware?
> model name      : AMD Phenom(tm) II X6 1090T Processor
> cpu MHz         : 3210.771
> cache size      : 512 KB
> guesses: 13  time: 0:00:01:12 0.00%  c/s: 8270  trying: pee64 - pigi4
> [alex@...x-pc ~]$ zip2john > zipfile.john
>>02-10_hosts.csv is using AES encryption, extrafield_length is 11
> [alex@...x-pc ~]$ john --incremental zipfile.john
> Loaded 1 password hash (WinZip PBKDF2-HMAC-SHA-1 [32/64])
> Note: This format may emit false positives, so it will keep trying even after
> finding a possible candidate.
> ashoon           (
> matou            (
> brypoo           (
> abe113           (
> br1e2            (
> 0706812          (
> ...
> Any ideas greatly appreciated.
> Thanks,
> Alex

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