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Date: Tue, 21 May 2019 08:56:33 +0000
From: Dudy Dudy <>
To: "" <>
Subject: RE: zip2john fails to hash my zip file


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?

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


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