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Topic: Digital signatures
Conf: (P-PDF) Developers, Msg: 33710
From: size
Date: 1/28/2002 09:30 PM

I'm investigating the possibility to digital sign PDF files. I would like to evaluate a digital signature using my customer's certificate private key and then send the PDF via e-mail. The recepient sould be able to open the PDF with th reader and verify the signature.

I'm made some work with Acrobat 5.0 and noticed that there aer two ways to sign the file

1. The "invisible" way (which i prefer)
2. The "stamp" way

1.
I've signed the same PDF with the two different methods.
With the first try i had to create a "Adobe User Profile"(or something similar) which is a RSA 1024 bit key Acrobat uses to sign the file and everything went fine. When i opened the file with the Reader on an other PC i can see no way to verify the digital signature.

2.
With the second try, Acrobat used the profile i've created in Step 1 and added a stamp over the PDF. I opened the PDF with the reader on the other system, clicked on the stamp, selected Verify Signature and the reader shows a message saying that "Digital Signature plug-in not installed". I've looked through my Acrobat 5.0 CD but found anything regarding this!

So my questions are

1) Using the first method will i be able to develop a tool that using a VeriSign certificate signs a PDF that can be viewed and sign-verified by the Reader?
2) Do you know where i can find the plug-in at point 2??
3) Does anybody here had experience on this?

I'm attaching the two files.
Regards
Nicola

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