Is there a way to digitally sign a PDF file - similar to how we
digitally sign email messages?
I am getting ready to publish a document in PDF and I want to make
sure that it is not modified at all, or at least to make sure that
the user can verify that it is the authentic document I created.
The commercial product for the digital signing of PDF documents would
be Acrobat, however, Adobe uses Entrust Technology embedded in
Acrobat which does not interact with the built in PKI of Mac OS X
10.3.x or 10.4.x.
If you are an agency/division running Mac OS X 10.4 and using built
in Smart Card Services you can send the document via a Signed email
message - ensures integrity of contents sent by sender. This does
NOT imply document signing, but the attachment is part of the signed
message -- integrity validated. Once the document is removed from
the message, the integrity validation would be lost.
-Shawn
___________________________________________
Shawn Geddis
Security Consulting Engineer
Apple Computer - US Federal Government
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