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Date: Tue, 17 Sep 2013 20:26:49 +0200
From: Florian Weimer <>
Subject: Research on better-than-brute-force attacks on PDF cryptography

I've looked at a PDF implementation, compared it against the 
specification (including Adobe's supplement covering AES-256), and 
unless I'm missing something, there are a few odd things there.

Does anyone know if there's published research into this topic?  I could 
only find indications that the specification does not adequately defend 
against brute-force password guessing.  Which is probably true, but not 
exactly my concern.

Florian Weimer / Red Hat Product Security Team

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