![]() When using the Preference Reference, pay attention to the supported versions, OS, and other details. Learn about setting registry and plist preferences, including feature locking, paths, the relationship between the UI and the registry, and other topics. Click OK in the trust settings pop-up dialog, and then click OK.ĭid you find it helpful? If yes, share your experience with us: Join the conversation here.To leverage Acrobat’s rich digital signature capabilities, follow these best practices:įamiliarize yourself with this guide, the Preference Reference, and the Customization Wizard. In the Certificate Viewer dialog box, click the Trust tab, and then click Add To Trusted Certificates.ĥ. In the Signature Properties dialog box, click Show Signer's Certificate. Right-click the signature, and then click Show Signature Properties.ģ. Click the Signatures button in the left-pane.Ģ. To add the certificate that was used to apply the digital signature into Adobe’s list of Trusted Identities, do the following:ġ. You will not be able to manually validate the signature until the certificate is trusted by Adobe. If you open such a PDF, you will see a warning At least one signature has problems.įor security reasons, Adobe does not recommend adding a self-signed certificate, or any random certificate to Adobe's list of Trusted Identities. ![]() A self-signed certificate is a certificate that you have generated yourself using a third-party application. NOTE: If the signature status is invalid, contact the signer about the problem.įor more information about signature warnings and valid and invalid signatures, see the Digital Signature Guide at Trust a signer’s certificateĭigital signatures that were added using a self-signed certificate cannot be automatically validated by Adobe as the certificate is not in the list of Trusted Identities that Adobe uses to validate signatures. If the document was modified after it was signed, check the signed version of the document and compare it to the current version. Acrobat and Reader display an alert message when validating signatures with expired timestamps.ĥ. For details about the signer’s certificate, such as trust settings or legal restrictions of the signature,Ĭlick Show Signer’s Certificate in the Signature Properties dialog box. To let Acrobat or Reader accept an expired timestamp, select Use Expired Timestamps in the Signature Verification Preferences dialog box ( Preferences > Signatures > Verification: More). This message is displayed if the timestamp signer's certificate expires before the current time. Signature is timestamped but the timestamp has expired - Acrobat and Reader validate a timestamp based on the current time. ![]() Signature is timestamped but the timestamp could not be verified - Timestamp verification requires obtaining the timestamp server's certificate to your list of trusted identities.Signature is timestamped - The signer used a Timestamp Server, and your settings indicate that you have a trust relationship with that timestamp server.Signature date/time are from the clock on the signer's computer - The time is based on the local time on the signer’s computer.Review the Validity Summary in the Signature Properties dialog box. For more information about the Signature and Timestamp, click Signature Properties.Ĥ. The Signature Validation Status dialog boxģ. Open the PDF containing the signature, then click the signature. For more information, see Set signature verification preferencesĢ. Set your signature verification preferences. You assess the validity of a Digital Signature and Timestamp by checking the Signature Properties.ġ. Steps to assess the validity of a digital signature: On opening a signed document in the application if the signature status shows as unknown or unverified, validate the signature manually to determine the problem and possible solution.
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