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Date: Tue, 28 Jul 2015 16:32:02 -0600
From: Matthew Smith <>
Subject: Re: unable to extract hash from 7z archive

Oh, I am using GPU.  I am running a small mask set on my GTX 880M(which
likes to overheat so I can't do much) and I have two EC2 G2.2xlarge with
one graphics card each for about 22 cents an hour.  I am running hashcat on
the GPUs but it would be nice to split the workload and use the CPUs as
well.  That's why I was hoping you could recommend come CPU based software
for linux that supports my hash.  I can't find anything.  The CPU version
of Hashcat doesn't support my hash, JTR doesn't, rarcrack won't resume from
shutdown, nothing else I saw would do what I need.

Thank you though.  If you think of anything please let me know.

On Tue, Jul 28, 2015 at 3:42 PM, magnum <> wrote:

> On 2015-07-28 23:13, Matthew Smith wrote:
>> I don't think I encrypted file names, so when I run the ""
>> script, I get this message:
>> file.7z : 7-Zip files without header encryption are *not* supported yet!
>>  From googling, I see threads where an author mentions adding it in the
>> future, but on github the file hasn't been updated in over two years.
>> I've
>> tried searching for a later version but I can't find it.
> Unfortunately we haven't implemented it yet. I was hoping the missing
> functionality was just within the conversion tool.
>  I've used "" to get the hash, but when trying that hash file
>> in john it doesn't seem to want to load.  Maybe I am doing something wrong
>> in the commands?
>> C:\johnomp\run>john --format=7z outfile.hashes
>> No password hashes loaded (see FAQ)
> I suppose this settles that oclHashcat can crack your hash (provided you
> have a GPU) but we can't. Well it was worth a try.
> BTW you probably need a GPU anyway - 7z hashes are very hard to crack. So
> maybe buy a cheap-ish GPU and try oclHashcat?
> magnum

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