Adobe READER 8 User Manual page 102

In the Certificate Viewer dialog box, click the Details tab and note the MD5 digest and SHA1 digest values (finger-
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print). Contact the certificate's originator to confirm that the values are correct. The certificate should be trusted only
if the values are correct.
After you verify that the certificate information is correct, click the Trust tab, click Add To Trusted Identities, click
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OK, specify trust options, and click OK.
Associate a certificate with a contact
Contacts are typically trusted identities with whom you exchange documents. To exchange encrypted PDFs with a
contact, you must associate at least one certificate with that contact.
Adding a contact may or may not add a certificate because certificates aren't necessarily attached to the contact infor-
mation. Add contact information by browsing to the contact file location or search for the file.
1 Choose Document > Manage Trusted Identities.
Select the contact, and click Details.
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3 Select a name from the list, and click Associate Certificate.
Select a certificate, and click OK. Click OK again.
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Verify information on a certificate
The Certificate Viewer dialog box provides user attributes and other information about a certificate. When other
users import your certificate, they may ask you to check your fingerprint information against the information they
receive with the certificate. (The fingerprint refers to the MD5 digest and SHA1 digest values.) You can check certif-
icate information for your own digital ID files or for ID files that you import.
The Certificate Viewer dialog box provides the validation period in which the certificate is valid, the certificate's
intended usage, and certificate data such as a unique serial number and public key method. You can also check if the
certificate authority has revoked the certificate. Certificates are typically revoked when an employee leaves the
company or when security is compromised in some way.
Verify information on your own certificate
1 Choose Document > Security Settings.
Select your digital ID, and then click Certificate Details
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Verify information on someone else's certificate
Choose Document > Manage Trusted Identities.
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2 Select the contact, and click Details.
Select the certificate name, and click Show Certificate.
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Click the Revocation tab, and then click Check Revocation.
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The results of the revocation check appear in the Details box.
Set the trust level of a certificate
You can change the trust settings of certificates. For example, if you have verified the fingerprint in a certificate that
you received from someone else, you can change the settings so that you explicitly trust all digital signatures and
certified documents created with this certificate. You can even choose to trust the certified document's dynamic
content and embedded JavaScript.
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