You can also allow your trusted identities from the Windows Certificate Store to be used during verification. If the time stamp authority’s certificate is not listed, you will have to request it from the signer.Ĭhoose Security > IDs and Certificates > Trusted Identities to manage your list of trusted identities. If the time stamp authority’s certificate is not trusted, click Add To Trusted Identities. Cause: This occurs when the digital certificate and digital signature associated with the PDF file have not yet been verified on the system. Then click the Show Certificate button in the General pane if the signer time-stamped from a third-party authority. Problem: When opening a PDF file containing a digital signature in PDF that was created on another system, the digital signature may display a 'Validity Unknown' or 'Signature not verified' message. In the Signature Properties dialog box, click the Date/Time tab to view the time stamp authority. In the Validation Status dialog box, click Properties. Right-click a signature and select Verify Signature from the shortcut menu. If there is no contact information for a known signer, use alternate means to verify the signature. If so, you can confirm the signature's origin by matching certificate numbers. Click Verify Identity to see if the user has entered contact information. If the Validity Status is Unknown, you will have to verify the signature by contacting the signer. The Validation Status information box shows the results.Ĭlick Properties for more information about the signature. Right-click a signature on the page and then select Verify Signature from the shortcut menu. Open a PDF document containing a digital signature. Verifying a signature means to check the signature validity and whether any changes have been made to the PDF document since it was signed. Verifying Digital Signatures Verifying Digital Signatures
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