Adobe ACROBAT 9 HOW-TOS Manual page 333

322
Sharing and Importing
Digital IDs
In order to open a docu-
ment signed by someone
else, you need a copy of his
certificate, called a trusted
identity. Choose Advanced >
Manage Trusted Identities
to open the Manage Trusted
Identities dialog. Your identi-
ties list can be displayed as
either certificates or contacts
in the dialog. Contacts are
the FDF (file data format)
files exchanged via an e-mail
request, while a certificate is
the public key included in an
encrypted document.
There are several important
tasks you can perform in the
dialog:
•
Click Add Contacts to open
a dialog in which you can
select, search, or browse
for contacts and certifi-
cates on your computer.
•
Click Request Contact
to open the E-mail a
Request dialog. Address
it to the person from
whom you'd like to
receive the contact.
•
Click Edit Trust to open
the Edit Certificate Trust
dialog and change the
policy features assigned
to a specific contact.
(continuedonnextpage)
C h a p t e r S i x t e e n
2. To build a new signature, click Add ID on the dialog's toolbar. The Add
Digital ID dialog opens, giving you four options. The first three deal
with existing IDs: You can find an existing ID from a file, a roaming
ID stored on a server, or a device connected to your computer (like a
smart card). To build a new ID, click "A new digital ID I want to create
now" and then click Next at the bottom of the dialog.
On Windows, the next dialog asks where you want to store the
Digital ID. You have two choices: The default is to create a new PKCS#12
digital ID file, or you can add the Digital ID to your Windows Certificate
Store (Windows). Click an option, and then click Next.
3. In the next dialog, add the information you want to include in the cer-
tificate, such as Name, Organization Name, and E-mail Address. At the
bottom of the dialog, make these choices:
•
Choose a Key Algorithm, which defines the level of encryption (and
the version of Acrobat that can open the file)—2048-bit RSA for
Acrobat 9, or 1024-bit RSA for Acrobat 7 or 8.
•
From the "Use digital ID for" menu, choose Digital Signatures, Data
Encryption, or Digital Signatures and Data Encryption; click Next.
4. In the final pane of the dialog, click Browse to choose a storage loca-
tion for the certificate, or leave the default location in the Security sub-
folder of the Acrobat program's installation folders so that you don't
lose track of your certificates. Type a password and a confirmation of
the password, and click Finish.
5. Close the Security Settings dialog.
Instead of using the default signature appearance, sparkle it up with
an image:
1. Choose Edit > Preferences (Acrobat > Preferences) to open the Pref-
erences dialog, and choose Security from the Categories menu. Click
New in the Digital Signatures preferences to open the Configure Sig-
nature dialog.
Making Your Documents Secure
From the Library of Daniel Dadian