Verifying Digital Signatures - Help!

[traceyc28668387]

I have a fillable PDF with multiple digital signature fields.  I checked the signatures panel on one of the documents I saved and none of the digital signatures have been validated, signer's identity is unknown etc.  I'm pretty sure it's important they are validated when they are digitally signed.  The last digital signature applied by the manager locks the PDF, not sure if that matters.  On the original document I checked out Preferences,  Signature Panel, Vertification and Verify signatures when the document is opened is ticked off.  Why are the signatures not verifying after the signatures are added to the PDF?  Please help me.

[Steve Cordero · Accepted solution]

It's likely that each of the Signatores has used a self-signed certificate rather than one provided by one of the certificate vendors in the Adobe Approved Trusted List .  If the signatures are self-signed, then you probably have not trusted the Signatores self-signed certificate.   In this case, the message that the certificate validity is "Unknown" is telling you that by this response.  If the Signatores had a certificate that was distributed by one of the Adobe Approved Trusted List vendors then Acrobat/Reader would say the certificate was "Valid" in most cases.

[traceyc28668387]

So I've done this which seems to work...

[traceyc28668387]

I click on Certificate Viewer and click on the Trust tab. A security box appears 'If you change the trust settings, you will need to revalidate any signatures to see the change. Trusting certificates directly from a document is usually unwise. Are you sure want to do this'. That worries me but anyways, I click ok and tick off Certified documents and the boxes below that. The signature is now verified

[traceyc28668387]

The 'usually unwise' scares me a bit, but I assume the signatures need to be valid on the form. Is there a way to default the original form so I don't have to do that manually every time?

[ls_rbls · Accepted solution]

If these are regular customers of yours once you trust those certificate you should be good to go.

[traceyc28668387]

Yeah! It works! I'm so happy!! Thank you so much!!!

[traceyc28668387]

I verified the signatures on the documents by trusting the certificates and I saved into our central filing system (we use edocs). Another co-worker opened the same document I saved but when he opened it none of the signatures were verified, however, I was seeing that they were verified. Is trusting the certificates bases on the individual's computer? Would having an Adobe Approved Trusted List solve this? Any help is appreciated, thank you so much!

[Steve Cordero · Accepted solution]

Yes, Adobe Approved Trusted List signing certificates provided by the AATL vendors are trusted by default in Acrobat.

[traceyc28668387]

I'm wondering, the document is very slow to open and says 'Verifying all signatures'. Could the reason it's so slow to open be linked with having the signatures self-signed rather than if the signatures were provided by one of the certificate vendors?

[ls_rbls]

PLease see correct answer by Try67 in the following forum: https://community.adobe.com/t5/Acrobat/Multiple-Signatures-Slow-Verification-Process/td-p/10319466

[ls_rbls]

And here: https://answers.acrobatusers.com/Is-the-a-way-to-stop-adobe-from-verifying-all-signatures-on-a-docum...

[ls_rbls · Accepted solution]

See if the steps in the slide helps:

And check the information in the following links too:

https://helpx.adobe.com/acrobat/using/trusted-identities.html

https://helpx.adobe.com/acrobat/kb/approved-trust-list2.html