At least one signature is invalid on digital signatures when i open with Adobe 2022.001.20142

[Perumal_C]

I ws signing multiple pages of a PDF document with digital signature, when i try to open the file in Adobe Acrobat Reader DC 2022.001.20142, its stating At least one signature is valid with X mark and in the last page i could see with green tick mark. Please can you help with this query.

[Perumal_C]

I was signing multiple pages of a PDF document with digital signature, when i try to open the file in Adobe Acrobat Reader DC 2022.001.20142, its stating At least one signature is invalid with X mark and in the last page i could see valid signature with green tick mark. Please can you help with this query.

[Amal.]

Hi there

Hope you are doing well and sorry for the trouble.

Is this an issue with a particular PDF file or with all the PDFs with signatures? Please try with a different PDF file and check.

What is the version of the OS you are using? Please try to repair the installation from the help menu (Win Only) and reboot the computer once.

Please check for any missing/pending updates for the computer OS and try updating it.

You may also try to reset the Acrobat preferences as described here https://community.adobe.com/t5/acrobat-discussions/how-to-reset-acrobat-preference-settings-to-defau... and check.

Regards

Amal

[MikelKlink]

You don't clearly say how you sign your document.Also you say that you were signing multiple pages of a PDF document - this is weird because a digital signature always signs the complete document at the time, so you were signing all pages at once.

Thus, please explain more clearly what your exact use case is and how it fails.

[Perumal_C]

Hi, Thank Mikel, I have a software tool to sign only the specified pages in a PDF document. The PDF document I am using has 8 pages and I am digitally signing with Class 2 digital signature on the pages 2,5,6,7,8. After I digitally sign this PDF, if I open this in latest version of Adobe, in Pages 2,5,6 and 7 the signature is showing as invalid with X mark and in page 8 signature is showing as valid with green tick mark. If I open the same file with the Adobe older versions all the pages are showing with green tick mark and it's valid.

[absethi]

Hi,

What tool are you using to Digitally Sign?
Will it be possible to share the file with us?

Thanks

[MikelKlink]

I have a software tool to sign only the specified pages in a PDF document.

That's not a feature of interoperable digital PDF signatures. Thus, either that tool is creating something not interoperable, or it incorrectly communicates that it only signs specific pages while the signatures actually cover the whole document.

Thus, please share an example PDF illustrating the issue for analysis.

The PDF document I am using has 8 pages and I am digitally signing with Class 2 digital signature on the pages 2,5,6,7,8. After I digitally sign this PDF, if I open this in latest version of Adobe, in Pages 2,5,6 and 7 the signature is showing as invalid with X mark and in page 8 signature is showing as valid with green tick mark. If I open the same file with the Adobe older versions all the pages are showing with green tick mark and it's valid.

This sounds like your tool applies regular digital PDF signatures (covering the whole document each). But either it does so incorrectly (breaking previous signatures whenever adding a new one), or the first PDF revision (either an unsigned initial revision or the first signed one) already includes a structural error that makes Adobe Acrobat hiccup on later intermediate signatures.

Adobe Acrobat validation has become more sensitive to either kind of errors in the recent months and fails validation where it used to ignore the errors. 

For some examples see these threads:

• Invalid signatures after Adobe Reader update (2022.001.20085) 
• Adobe Acrobat when doing a signature which invalidates previous signature 
• Digital Signature Shows Valid in Bluebeam and DocuSign Prepare & Sign but not Adobe 

[absethi]

Hi @Perumal_C ,
Can you please share the signed file with us?

Thanks 

[absethi]

Hi @Perumal_C ,
Is the issue still happening for you, Have you tried with the latest updated version?
Can you please share the file with us if the issue is still reproducble?
Thanks 

[snokas782721]

Dear @absethi and @Amal. 

This issue i describe appers when you have proteced mode enabled. If i disable protected mode signing works. In version 2022.001.20117 i could use proteced mode and sign pdf with certificate. Why is it not working any more? We need to have proteced mode enabled for seecurity reason.

Could you look into this? Thanks

[snokas782721]

Hi,

Since we updated Adobe Acrobat Reader DC to 2022.001.20142 version we cannot digitaly sign our PDF documents.

Open a random pdf-file

Click tools - certifice

Click sign digitally

Choose where to put your signature

Choose your certificate

Check "lock document after sign" (same issue if you don't doh)

Click sign

Pop up askes were to save the file

Save the file

Then this error occurs and my sign NRKNLA dissapers

Error something like: windows supplier of cryptography reported an issue - ASN1 - incorrectly tag value. Error code 2148086027

Any ideas?

[snokas782721]

I can confirm that this works version 22.001.20117

[snokas782721]

@absethi @Amal. Could you please look into this issue i describe? Maybe this also affects @Perumal_C issue?

Thanks

[Amal.]

Hi there

We are sorry to hear that. Please go through the help page https://helpx.adobe.com/acrobat/kb/windows-cryptographic-service-provider-error-214794205.html and see if that works for you.

You may also check the correct answer marked in the similar discussion https://community.adobe.com/t5/acrobat-reader-discussions/windows-cryptographic-service-provider-rep...

Regards

Amal

[snokas782721]

Hi @Amal. 

Sorry for my late response due to holidays.

Unfortunately this is not working. This issue is also in the later versions 22.002.20191 and 22.001.20169.

Please advise.

Thanks