From: mparson@dp-austin.net
Date: Mon, 17 Aug 1998 09:42:23 -0700 (PDT)
To: cypherpunks@toad.com
Subject: Re: Adobe Acrobat encryption details
In-Reply-To: <Pine.BSI.3.95.980817105445.1266A-100000@mail1.i1.net>
Message-ID: <199808171641.LAA05889@fargo.imtdirect.com>
MIME-Version: 1.0
Content-Type: text/plain


In message <Pine.BSI.3.95.980817105445.1266A-100000@mail1.i1.net>, you write:
> 
> Hi all,
> 
> I was hoping someone might be able to point me to details on .PDF file
> encryption.  I'm specifically interested in key-generation (which hash is
> used?) and if there is consistant known-plaintext in .PDF file headers.
> 
> I've searched around, and all I can find is that Acrobat uses rc4, which
> isn't very helpful...

I don't have any info on this sort of thing, but you can check out the
latest versions of Ghostscript (at least the 4.01 version I've got
installed), it has ps2pdf conversion utils, might give you an idea on
how they encode 'em.

--
Michael Parson
Systems Administrator
IXC Communications, Inc.
The Data Place - Austin