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Seamountain
Participating Frequently
October 22, 2021
Question

Digital Signature. document changed, invalid signature.

  • October 22, 2021
  • 1 reply
  • 19668 views

Hi, I have a problem when I digitally sign a document in Reader.

Reader states that "the document has changed after signing" but no changes have been made.

I use Reader DC 2021 007 20091 and Windows 10 20H2.

 

Why does Reader say so and state that the signature is invalid?

    1 reply

    Amal.
    Community Manager
    Amal.Community Manager
    Community Manager
    October 22, 2021

    Hi there

     

    Hope you are doing well and sorry for the trouble. As described, when I digitally sign a document in Reader.  Reader states that "the document has changed after signing.

     

    Is this a behavior with a particular PDF file or with all the PDFs that you digitally sign? Please try with a different PDF file and check.  If the file is stored on a shared network drive, please download it to your compouter first and try signing it and check.

     

    You may also try to sign the PDF file online via Document Cloud https://documentcloud.adobe.com/link/home/ and see if that helps.

     

    Regards

    Amal

    S
    SeamountainAuthor
    Participating Frequently
    October 22, 2021
    556 / 5000
     

    Översättningsresultat

    Hi Amal,
    It does not matter if the document is stored locally on my computer or on a network device, I get the same problem with Adobe saying that the document has been modified, with the result that the signature is invalid.
    I did not test to sign online because it is not an alternative for me.
    I have seen some posts from 2017 about SHA1 and SHA256 and if I change the windows registry so that Adobe will use SHA1, I will not get the error that the document has been changed.
    So what is it that makes Adobe think the document has changed if I use SHA256?
    MikelKlink
    MikelKlink
    Participating Frequently
    October 24, 2021

    Please share an example PDF before and after signing for analysis.

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