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Chapter 7: Validating digital signatures
When you validate a digital signature, you verify the identity of the person who signed the PDF. In many cases, you’ll
need the signer’s certificate to validate their digital signature.
Quickstart
Validate signatures
When you open a document, a status icon appears next to the signature, indicating if the signature is valid.
1 Click Signatures in the navigation pane, and select the signature.
2 Right-click/Control-click and choose Show Signature Properties.
3 Use the various tabs and options in the Signature Properties dialog box to resolve any signature issues. For
example, if the identity is unknown or unverified, click the Signer tab, and click Show Certificate to determine if the
certificate is trusted.
Share your certificate
Your digital ID includes a certificate that others require to validate your signature and encrypt documents for you.
1 Choose Document > Security Settings.
2 Select Digital IDs on the left.
3 Select the ID you want to share, and click Export .
4 Follow the on-screen instructions to email the certificate or save it to a file.
If you use a third-party security method, you usually don’t need to share your certificate with others.
Validating signatures
Checking the validity of a signature
By default, signatures are validated when you open a PDF. An icon appears in the signature field on the document
page to indicate the signature status. Further details about the status appear in the Signatures panel and in the
Signature Properties dialog box.
Third-party signature handlers may provide alternate methods of validating signatures. Check the documentation
included with your third-party digital ID.
Important: To ensure that signatures are validated when you open a PDF and that all verification details appear with
the signature, set your verification preferences in advance (see “Set signature verification preferences” on page 94).
• The digital signature icon along with the name of the field in the Signatures panel indicates the presence
of an unsigned signature field.
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