What do you mean you are "resigning" the first signature field? Can you post a
PDF that shows where you have done this??
Leonard
From: Rouan van Dalen <[email protected]<mailto:[email protected]>>
Reply-To: Rouan van Dalen <[email protected]<mailto:[email protected]>>,
Post here
<[email protected]<mailto:[email protected]>>
Date: Mon, 24 Oct 2011 06:55:01 -0700
To: Post here
<[email protected]<mailto:[email protected]>>
Subject: [iText-questions] Resigning digital signatures in PDF not invalidating
other signatures
Hi everyone.
I am having some trouble with understanding the digital signature concept.
I am using ITextSharp and can add signatures just fine. I have multiple
signature fields in my PDF document.
When signing the PDF, I first create the certification signature (one per pdf)
and allow CERTIFIED_FORM_FILLING,
In append mode. I then add the approval signatures to each of the 4 signature
fields in the PDF no problems.
Now when I resign the first signature field, none of the other signatures are
invalidated. Is this expected
behaviour? I need to detect tampering with the document and to detect if
someone changes the signature
for a specific revision in the PDF, so that I can detectforgery or substitution
of digital signatures.
I would just like to confirm that I am using the digital signatures correctly
and that I don’t need some other
Feature to do what I need.
TIA
Regards
Rouan
------------------------------------------------------------------------------
The demand for IT networking professionals continues to grow, and the
demand for specialized networking skills is growing even more rapidly.
Take a complimentary Learning@Cisco Self-Assessment and learn
about Cisco certifications, training, and career opportunities.
http://p.sf.net/sfu/cisco-dev2dev
_______________________________________________
iText-questions mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/itext-questions
iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
