A friend of mine pointed me to a good article on securing PDF documents. http://secforall.info/2009/06/29/securing-pdfs/ It’s a good tutorial on how to password protect, digitally sign and certify PDF documents. Now if only we could have some intelligence in email clients (or maybe a setting in Acrobat Reader?) that would prohibit or at least strongly warn when a user tries to open an un-signed PDF. This would make my life much easier from a malware perspective…..I think.
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