I've looked at it, and it seemed to me that it was pretty straight forward to build a cracker for it. There are commercial "Password recovery" programs.
This isn't a bad summary... http://www.cs.cmu.edu/~dst/Adobe/Gallery/anon21jul01-pdf-encryption.txt and I think the answer to your question is.... Adobe's PDF protection scheme is a classic example of security throughd obscurity. They encrypt the content of a PDF file and hope that no one figures out how to decrypt it. personally I would use gpg for email. John Orthoefer jco{at}direwolf.com On Feb 17, 2013, at 8:53 AM, Scott Ehrlich <[email protected]> wrote: > How safe is a password-protected PDF file sent via email? > > I've never run a sniffer to see what could be learned from doing this. > > Thanks. > > Scott > > _______________________________________________ > bblisa mailing list > [email protected] > http://www.bblisa.org/mailman/listinfo/bblisa
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