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C
Christoph3174604382uc
Participant
September 7, 2023
Question

Signature invalid only in Adobe - Other programs are verifying the signature

  • September 7, 2023
  • 1 reply
  • 1639 views

I've got a PDF. I am signing it and then add another signature. The first becomes invalid due to changes in the pdf. This happens even though nothing has changed in the byterange of the signature.

 

This also happens when adding dss information after the signature.

 

The problem is only visible in Adobe Reader. Other pdf signature verifing softwares are verifying my signatures. F.e. the EU service: https://ec.europa.eu/digital-building-blocks/DSS/webapp-demo/validation

 

What can I do make adobe verify the signature?

An example PDF is attached:

"eep_GdPicture.pdf" -> unsigned original

"eep_GdPicture_signed.pdf" -> two invalid (says only adobe) signatures 

This topic has been closed for replies.

1 reply

C
Christoph3174604382ucAuthor
Participant
September 19, 2023

I haven't found a solution yet. Does anyone have an idea?

P
Peter Mate35249643wi1s
Participant
February 5, 2024

I found something which is opposite to this. I created a PDF with multiple signatures and seal, one of the signatures is qualified. The Acrobat Reader says that this signature is okay and qualified. The Validation Authorities say that the status of this signature is "indeterminate". But the result of the Acrobat Reader is not an official result, so the result of the Validation Authorities shall be considered as valid. Consequently the validation process in Acrobat Reader is wrong.https://drive.google.com/file/d/1gY66R7M_QrfqIGcVGAVdBJwoMAzfpqhj/view?usp=sharing https://drive.google.com/file/d/1OBd7G3wF_q6L3wMFSxAuatEZton2Uu20/view?usp=sharing 

 

https://drive.google.com/file/d/1OBd7G3wF_q6L3wMFSxAuatEZton2Uu20/view?usp=sharing 

 

Any idea?

 

Best Regards,

Peter

C
Christoph3174604382ucAuthor
Participant
February 5, 2024

Hello Peter,

it seems that the last certificate that you are using is not in the EU or Adobe Trust list. Therefore the authorities cannot determine the validity of the signature.

 

Szia,
Chris

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