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Date: Tue, 21 May 2019 20:58:15 +0200
From: magnum <>
Subject: Re: zip2john fails to hash my zip file

On 2019-05-21 10:56, Dudy Dudy wrote:
> I followed your advice and could very easily produce an archive that presents the same problem.
> Using 7zip's UI on Ubuntu, it's easy to create an archive with the following characteristics (mostly default values):
>    *   Archive format: zip
>    *   Compression level: Normal
>    *   Compression method: Deflate
>    *   Dictionary size: 32 KB
>    *   Encryption method: AES-256
> When running zip2john on the resulting file, I get a gigantic hash (several screens) and the final line is:
> ver 81.9 is not encrypted, or stored with non-handled compression type
> Does this help?
> Is there a way to feed the original information to zip2john?

Thanks, then we should be able to reproduce the problem. I opened an 
issue on GitHub for it:


> ________________________________
> De : magnum <>
> Envoyé : lundi 20 mai 2019 19:48
> À :
> Objet : Re: [john-users] zip2john fails to hash my zip file
> On 2019-05-20 21:30, Solar Designer wrote:
>> This is in addition to magnum's answer (which is correct and
>> JtR-centric, as is most appropriate for this list, but I feel I can add
>> beyond-JtR material as well).
> Those additions might be correct or not in this case, I'm not sure
> (anyway they are definitely good things to know).
> As far as I understand, nothing in the mentioned zipinfo output confirms
> it's really a pkzip-type file at all (or does it?). In fact (again I'm
> not sure about anything here) off the top of my head the "minimum
> software version required to extract:   5.1" tells us this is likely
> beyond pkzip and more like winzip (but apparently there's no certainity
> it's even that - it could be some mish-mash that only 7z is able to
> produce).
> magnum

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