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List:       freedesktop-poppler
Subject:    Re: [poppler] Encrypt with Revision 6 and AES256
From:       Leonard Rosenthol <lrosenth () adobe ! com>
Date:       2013-10-20 23:48:05
Message-ID: CE89E3D8.344A0%lrosenth () adobe ! com
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The documentation is in the Extension Level 8 docs as well as drafts of
ISO 32000-2 for at least 2 years now.

Leonard

On 10/20/13 7:26 PM, "Brad Hards" <bradh@frogmouth.net> wrote:

>On Mon, 21 Oct 2013 12:29:17 AM Albert Astals Cid wrote:
>> Does anyone have any clue where the spec that mentions Encrypt with
>>Revision
>> 6 and AES256 is?
>> 
>> There's such a file at
>>https://bugs.freedesktop.org/show_bug.cgi?id=70704
>> but I can't find anything newer than ISO_PDF32000_2008.pdf and it's not
>> mentioned in there.
>http://www.pdflib.com/knowledge-base/pdf-security/encryption/ (via
>wikipedia) 
>discusses this a bit, but not enough to implement it, and my google foo
>can't 
>find Extension Level 8 documentation.
>
>
>WARNING: Link below is reverse engineered code from acroread binary!
>
>There is documentation on this algorithm at:
>http://esec-lab.sogeti.com/post/The-undocumented-password-validation-algor
>ithm-of-Adobe-Reader-X
>but it is not from a specification, but instead from adobe object code.
>
>Brad
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