Signatures are validated when a document is opened, and then automatically re-validated when anyone changes the document. To view the status of your certificates and signatures, do one the following:. View certificates and signatures in the Signatures pane.
Methods to secure a PDF file with certificate security
Look at certificates and signatures on the page of the PDF document.
- The Signatures pane. The Signatures pane lists all signatures in the PDF document, shows their validity status, and provides a summary of each signature.
- If your PDF document contains signatures, the Signatures tab appears on the left of the window. To open the Signatures pane, click the Signatures tab. TIP: To jump to the location of a signature in the document, click on the signature in the Signature pane.
- A yellow rectangle highlights the selected signature. View signatures and certificates on the page of a PDF document.
- To see more information about a digital signature or certificate from the page of a PDF document, click on the signature.
- The Signature Properties dialog appears, and lets you do the following:. Validate signature: confirm the validity of a digital signature.
To apply certificate security with a specific profile:
- Document modification: see whether the document is unchanged, or if the file is restricted to permitted changes, such as filling-in form fields.
- Time validity: shows that the timestamp of the PDF document is one of the following: 1.
To manage certificate security:
Based on the clock from the signer’s computer.
- Has a timestamp that cannot be verified.
- Timestamped and verified from a timestamp server.
- View certificate: shows you information about the person who signed the document, the expiration date of the certificate, and who issued the certificate.
- You can also see the encryption standard and digital encryption fingerprints.
- Add to Trusted Contacts: add the person who signed this PDF file to your list of contacts. For more information, see Manage trusted contacts.
- Digital IDs let you encrypt files that can only be opened and used by people who have exchanged certificates.
Certificate-based security has many advantages over password-based security: documents can be opened without the need to remember passwords, Digital IDs cannot be shared or copied easily, the one document can contain different security settings for each recipient of a file.
- For example, you may grant one person editing and printing privileges, while another is limited to just viewing the file.
- Before you can receive files encrypted for your digital ID, you must create your digital ID and then share its certificate with people who you intend to share certificate-secured files.
- You must have also received and imported the certificate of the recipient before you can encrypt files for their use.
- Note: When you use certificate-based security, remember to add your own certificate as an intended recipient.
- Otherwise, you will not have access to the PDF file when it is secured.
There are two ways to secure a PDF file with certificate security.