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Validating Digital Signatures in Adobe
Table of Contents
Validating Digital Signatures in Adobe......................................................................................................1
1. Validate the Signature using Windows Integration...........................................................................3
2. Add the Root Certificate on Adobe Trusted Identities......................................................................7
3. Export/Import the FDF (Acrobat Forms Data Format)...................................................................12
4. Validate Adobe Timestamps............................................................................................................18
5. Other Validation Settings.................................................................................................................23
Usually, the digital certificates are issued by a Root CA (Certification Authority). 
If the Root CA that issued the signing certificate is not included in Adobe Trusted Identities, the digital
signature is considered "not trusted" (but NOT invalid) when the document is opened in Adobe Reader
(see example below).
This behavior has nothing to do with the signing engine (e.g. PDF Signer, Adobe Reader) but with
the Adobe certificate validation procedure.
The user can validate the signature if the Root CA is already installed on Microsoft Certificate Store
(see the section Validate the Signature using Windows Integration). 
As an alternative, the recipient must manually add the Root Certificate of the signing certificate on
Adobe Trusted Identities because only a few Root CA's are considered trusted by default by the Adobe
certificate validation engine (See this article: http://www.adobe.com/security/partners_cds.html
).
Page 1 - Validating Digital Signatures in Adobe
The digital signature in not trusted
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Page 2 - Validating Digital Signatures in Adobe
The digital signature is not trusted
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1. Validate the Signature using Windows Integration
You can use this method if your digital certificate is issued by a Root CA already installed on Microsoft
Certificate Store. Microsoft and Adobe use different Certificate Stores and different certificate
validation procedures.
To see if your Root CA is installed on Microsoft Certificate Store, go to Start – Run – certmgr.msc 
Page 3 - Validating Digital Signatures in Adobe
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You can also import your Root Certificate here.
Page 4 - Validating Digital Signatures in Adobe
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After you check that your Roor Certificate is installed, in Adobe Reader go to Edit menu – Preferences
option – Security tab – click on Advanced Preferences button – Windows Integration tab and check all
checkboxes.
Page 5 - Validating Digital Signatures in Adobe
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When the document is re-opened, the digital signature is considered valid.
Page 6 - Validating Digital Signatures in Adobe
Valid Signature
2. Add the Root Certificate on Adobe Trusted Identities
Some of the Root CA's are included by default in Windows Certificate Store (Trusted Root
Certification Authorities) and only a few are included in Adobe Trusted Identities. 
Because the Root CA of the signing certificate is not included on Adobe Trusted Identities, the
signature is considered “not trusted” (but NOT invalid).
Page 7 - Validating Digital Signatures in Adobe
Signature is not trusted
To manually add the Root Certificate on the Adobe Trusted Identities, open the signature properties and
click Show Certificate and select Trust tab.
Be sure that you have selected the topmost Root Certificate.
Page 8 - Validating Digital Signatures in Adobe
Trust a CA certificate
Press Add to Trusted Identities tab and be sure you have checked all checkboxes, as below.
Page 9 - Validating Digital Signatures in Adobe
Trust a CA certificate
After all dialog boxes are closed and the document is re-opened, the signature is considered Valid.
Page 10 - Validating Digital Signatures in Adobe
Valid digital signature
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