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 detect
forgery 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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