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O
oferlapid
Participant
August 26, 2017
Question

The document has been altered or corrupted since the Signature was applied

  • August 26, 2017
  • 4 replies
  • 36455 views

Using reader DC 17.012.20095 and a valid certificate stored in my Windows Certificate Store

The certificate is trusted to Sign Documents or data as well as to Certify documents.

I sign a simple text file exported to PDF by Microsoft Word

As soon as signing is done I get to view the signed PDF in Reader DC and the signature is invalid

Signature is INVALID.

- The document has been altered or corrupted since the Signature was applied.

- The document is signed by the current user.

Have no clue how to fix this

Edit: Signing with self created certificate works fine, so the issue is related to a purchased certificate from a trusted CA in which trust setting is explicitly permitting

Sign documents or data

Certify documents

Other three options are denied:

Execute dynamic content that is embedded in a certified document

Execute high privilege JavaScript that are embedded in a certified document

Perform priviledge system operations (networking, printing, file access, etc.)

Please help

Thank you

Message was edited by: Ofer Lapid

4 replies

skillful_cause16B6
skillful_cause16B6
Inspiring
May 22, 2022

I had same issue using a certificate in Brazil that uses cloud authentication, solved removing cert. revogation info and using CAdES 

 

    S
    Stockton25111844w97g
    Participant
    July 4, 2022

    I'm facing the same issue when i unchecked the option "Include signature's revocation status" during signing a document. Is that mean this option must checked during signing? otherwise the signed document will show as invalid to the others?

    Thanks.

      R
      rafaelsms
      Participant
      December 29, 2023

      Hello!

       

      I got here because the 300 KB PDF became 2.3 MB after my signature... The PDF has two signatures: mine and another person's. The other person's signature does not contain the embedded CRL somehow and everything is fine for Adobe. My signature needs the CRL info otherwise it shows the "altered or corrupted" error.

       

      Then I tested using CAdES and unselecting signature's revocation status. Adobe shows no LTV for my signature, but checking the signature status at https://validar.iti.gov.br/ shows everything is fine until the certificate expires (for both mine and the other person's signature).

       

      I still haven't found how the other person's signature does not contain CRL info and still gets LTV in Adobe... But anyway, it seems good enough for ICP validation, I will try and remember checking https://validar.iti.gov.br/ again after both our certificates are renewed in a few months so we can know for sure how trustworthy is LTV.

      L
      lgp1985
      Participant
      September 13, 2021

      I'm facing the same issue; I'm just picking my certificate as part of digitally signing any PDF and I receive: The document has been altered or corrupted since the Signature was applied

      What am I doing wrong?

       

      L
      Luis Claudio5C34
      Participating Frequently
      December 5, 2021

      Same here.

      So far I´m using another software when I need to sign a PDF document (the problem only happens with Acrobat Reader), but I wold appreciate if someone can point a solution.

       

      B
      Brian353506979wie
      Participant
      July 7, 2025

      Try setting the Default Signing Format to CAdES-Equivalent (Edit/Preferences/Signatures/Creation&Apperance.  It worked for me.


      This worked for me as well

      O
      oferlapidAuthor
      Participant
      January 26, 2018

      I followed your instructions and now my certificate is trusted on my machine

      Still I get this signature invalid right after signing

      Signature is INVALID.

      - The document has been altered or corrupted since the Signature was applied.

      - The document is signed by the current user.

      Please help

      Adorobat
      Community Manager
      AdorobatCommunity Manager
      Community Manager
      February 21, 2018

      Hi Oferlapid,

      Sorry for the delay in response.

      Could you please try editing trust settings for certificate and see if that changes this behavior?

      Go to Edit > Preferences > Signatures > Identities & Trusted Certificates > More

      Trusted certificates > scroll down to the certificate > and click Edit Trust, check the box next to certified documents.

      Below is the screenshot:

      Also, try with another pdf file to check if its not specific to this pdf file only.

      Thanks,

      Shivam

      H
      hankn
      Participant
      November 5, 2019

      I too have the exact same problem.  Using Adobe Reader DC 2019.021.20049.

      I have checked the:

      Go to Edit > Preferences > Signatures > Identities & Trusted Certificates > More

      Trusted certificates > scroll down to the certificate > and click Edit Trust, check the box next to certified documents.

      and all the check boxes are properly marked.  Yet when I open a the PDF file (local file store on PC) I get the same error as listed:

      Adorobat
      Community Manager
      AdorobatCommunity Manager
      Community Manager
      September 14, 2017

      Hi Ofer,

      As per the issue description mentioned above, you are getting Signature is invalid error when viewing a pdf file signed by your certificate ID, is that correct?

      The reason for this behaviour could be the misconfiguration of the Trusted identities in Reader. Try the troubleshooting steps suggested in the following link:Signature valid or invalid

      Thanks,

      Shivam

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