1998-08-17 - Re: Adobe Acrobat encryption details

Header Data

From: mparson@dp-austin.net
To: cypherpunks@toad.com
Message Hash: b00bb1312dcffb3f674497ea2a0280965d4493259a919cc81f47277c0106c340
Message ID: <199808171641.LAA05889@fargo.imtdirect.com>
Reply To: <Pine.BSI.3.95.980817105445.1266A-100000@mail1.i1.net>
UTC Datetime: 1998-08-17 16:42:23 UTC
Raw Date: Mon, 17 Aug 1998 09:42:23 -0700 (PDT)

Raw message

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