5. If the fingerprint numbers on your screen match the numbers given to
you over the phone, click the Trust Identity button.
The Certificate Security-Alert dialog box opens, telling you that Trusting
Certificates directly from a document is unwise.
6. Click OK to close the Alert box and open the Import Contact Settings
7. Click the Import button and then click OK in the Import Complete
dialog box to add the person to your list of trusted certificates and to
validate the selected signature in the PDF document.
You can quickly validate individual signatures for the people you’ve added
toyour Trusted Certificates list (see the following section, “Adding certificates
to your Trusted Certificates list”) by simply double-clicking their signature
fields. Acrobat will quickly search your list and, upon finding the person’s
certificate, display a Signature Validation Status alert dialog box, informing you
that the signature is valid. You can also use this technique on your own signa-
tures in the event that they show up as unknown signatures when you reopen
the PDF document, even when your Digital ID file is open. To update all the sig-
natures in your PDF at one time, simply choose Document➪Digital Signatures➪
Validate All Signatures in Document, or select the Validate All Signatures in
Document option on the Signatures palette Options pop-up menu.
Exchanging certificates with associates
You can simplify the process of validating signatures in the PDF files you
review by having all the review team members exchange copies of their Self-
Sign Security certificates. Acrobat makes this easy by adding an export func-
tion to the Manage Trusted Identities dialog box. To open this dialog box,
choose Advanced➪Manage Digital IDs➪Trusted Identities. Select your Digital
ID from the list box in the Manage Trusted Identities dialog box and click the
Export button to open the Data Exchange File - Export Options dialog box.
Two radio buttons appear in the Export options section. The first is the E-mail
the Data to Someone radio button that you can select to send a copy of your
certificate to team members in a new e-mail message. The second is the Save
the Data to File radio button that you can use to make a copy of the certificate
file that others can import into their Trusted Certificates list. (For example,
you can use this option if you and your coworkers are on the same network
and share access to certain folders.)
When you select the Save the Data to a File radio button, Acrobat opens an
Export Data As dialog box, where you can designate the drive and folder on
which the copy of your certificate is saved (saved in a special Acrobat Self-
Sign key file format that uses a .fdf file extension) when you click the Save
button. When you select the E-mail the Data to Someone radio button, Acrobat
opens the Compose E-mail dialog box, as shown in Figure 11-10.
Chapter 11: Securing PDF Files