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I will try and see if I can produce a document which I can publish online.
I mean that I have a PDF document with SignatureFieldA already signed. I then
sign SignatureFieldA again with a different signature appearance
(thi signature capture from a signature pad device.). I was expecting the
other signatures to invalidate. I am signing SignatureFieldA with the same
certificate and same data. Does that make a difference?
Regards
________________________________
From: Leonard Rosenthol <[email protected]>
To: Rouan van Dalen <[email protected]>; Post here
<[email protected]>
Sent: Monday, 24 October 2011, 16:20
Subject: Re: [iText-questions] Resigning digital signatures in PDF not
invalidating other signatures
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]>
Reply-To: Rouan van Dalen <[email protected]>, Post here
<[email protected]>
Date: Mon, 24 Oct 2011 06:55:01 -0700
To: Post here <[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
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