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Date: Sat, 18 Jul 2015 19:47:52 +0200
From: Marek Wrzosek <>
Subject: Re: restore difficult zip password

Hi Kamil!

How difficult is this password exactly? Is it totally random? What set
of characters have you used? Do you remember anything about this
password? E.g. it's length, internal structure (how many letters or
digits and where) and so on. JtR has mask mode and if you narrow it
down, maybe it'll be faster then incremental. Also, incremental mode
uses different char-sets, so if you know that there were e.g. only
digits and letters, then "alnum" will be a lot faster than ascii
char-set. Moreover, besides --max-length JtR has --min-length option, so
if you remember that your password is longer than e.g. 4 characters,
then use --min-length=5 and you will not waste time for passwords that
are shorter (less difficult) and incorrect.

Best Regards

W dniu 17.07.2015 o 15:24, rysic pisze:
> Hi All!
> I'm quite new in John so, fist - Hello! :-)
> I need to restore one encrypted zip file but I was always using complicated passwords, so it is working very very slow.
> I'm trying it on 8core i7 CPU and after few days of working it is showing 0.12%.
> So, I started thinking about some cluster sollution but MPI is not working so good for me... :-/ Some hosts in cluster are working and some not.
> But i red here
> tis: "multiple instances of JtR can be run from within the same directory, sharing the same john.conf, john.pot, and other files just fine - this is a feature. "
> Soes this mean that I can install John The Ripper (1.8) in many computers, share some directory, put there .pot .zip .hash file and start all of them to work? And they will share this .pot file and work quite symilar to cluster?
> Kamil

Marek Wrzosek

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