Sharing And Managing Certificates - Adobe READER 8 User Manual

Expand or collapse a signature
❖
In the Signatures panel, click the plus sign (Windows) or triangle (Mac OS) next to the signature to expand it.
Click the minus sign (Windows) or the rotated triangle (Mac OS) to collapse it.
When collapsed, the signature shows only the name, date, and status.
Validate a time stamp certificate
If a signature displays the date and time, that time is the local time on the signer's computer. However, a second date
and time may appear in the Signature Properties dialog box, indicating that the signer uses a time stamp server. To
validate a signature contained a time stamp, you must obtain the certificate for the time stamp server and add it to
your list of trusted identities. Otherwise, the time stamp appears in the Signatures panel as unverified, and you must
validate the time stamp manually.
1 Click the Signatures button
the Options menu.
Click the Signature Properties button in the Signature Validation Status dialog box.
2
3 In the Signature Properties dialog box, click the Date/Time tab to view the time stamp authority, and then click
the Show Certificate button. (This button appears on the Date/Time tab only if the signer used a time stamp server.)
In the Certificate Viewer, click the Trust tab to determine if the time stamp certificate is trusted. If it isn't trusted,
4
click Add To Trusted Identities. If a certificate for the time stamp server isn't listed, request one from the signer.
See also
"Sharing and managing certificates" on page 95
View previous versions of a signed document
Each time a document is signed, a signed version of the PDF is saved with the PDF. Each version is saved as append-
only so that it cannot be modified. All signatures and their corresponding versions can be accessed from the Signa-
tures panel.
In the Signatures panel, select the signature, and choose View Signed Version from the Option menu.
1
The previous version opens in a new PDF, with the version information and the name of the signer in the title bar.
2 To return to the original document, choose the document name from the Window menu.

Sharing and managing certificates

Sharing certificates with others
Your digital ID includes a certificate that others require to validate your digital signature and to encrypt documents
for you. If you know that others will need your certificate, you can send it in advance to avoid delays when
exchanging secure documents. Businesses that use certificates to identify participants in signing and secure
workflows often store certificates on a directory server that participants can search to expand their list of trusted
identities.
in the navigation pane, select the signature, and choose Validate Signature from
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