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Adding content after signature invalids signature (only in adobe)

New Here ,
Aug 04, 2023 Aug 04, 2023

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I have an pdf. I signed it, then I add another signature. The first become invalid because of changed pdf. This also happens, when I add the dss-information after the signature.

The problem is only visible in adobe.

All other pdf-verifing software say "okay". The pdf is okay, because nothing is changed in the byterange of the signatur.

What can I do make adobe verify it okay?

I added examples:

The eep_GdPicture.pdf ist the unsigned original pdf.

eep_GdPicture_signed.pdf has two invalid signatures (says only adobe)

 

Bernd

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Security digital signatures and esignatures

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Community Expert ,
Aug 06, 2023 Aug 06, 2023

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When a signed document is modified after signing, the signatures become invalid. That's expected behaviour. Whatever other software you use, it's not working correctly.

ABAMBO | Hard- and Software Engineer | Photographer

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New Here ,
Aug 06, 2023 Aug 06, 2023

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But it´s an incremental update ... nothing is changed in the byterange of the sig ?!

 

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Community Expert ,
Oct 26, 2023 Oct 26, 2023

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If you change a document after signing, you changed the document and signatures need to get invalidated as the document is not anymore as signed.

ABAMBO | Hard- and Software Engineer | Photographer

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Community Beginner ,
Mar 01, 2024 Mar 01, 2024

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As you say if it was applied on an incremental update,  it may work. Maybe is a problem with gdpicture sdk, producer of that document?

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