Security - Adobe Acrobat and PDF for Architecture, Engineering, and Construction - page 128

9. In the final pane of the dialog box, specify the certificate's location on your hard drive or server. The
default storage location is Acrobat's Security subfolder, part of the program installation. Click
Browse to choose a different storage location.
10. Type and confirm a password used to apply the certificate when used. The password must be at least
six characters in length.
11. Click Finish to close the dialog box and save the new Digital ID. Acrobat stores the Digital ID in the
selected folder. You will see the new certificate added to the list in the Security Settings dialog box.
12. Click OK to close the Security Settings dialog box.
Figure 10.5 Specify a key algorithm and identifying information
Security Options
You can choose compatibility versions from Acrobat 3.0 to 7.0, which offer different levels of encryption.
Acrobat versions 3.0 - 6.0 use RC4 security algorithms at different bit values. RC4 is a stream cipher
produced by RSA Security. It uses an algorithm based on the use of a random permutation.
Acrobat version 7.0 offers the AES (Advanced Encryption Standard) method of security, a 1024-bit
encryption algorithm that can provide different levels of security for a document or just its attachments. It
is the encryption method presently used for securing sensitive but unclassified material by US
Government agencies.
Acrobat 4.0-compatible documents can be viewed by the most users, Acrobat 7.0-compatible
documents by the least number of viewers.
Customizing the Signature Appearance
Rather than using the basic appearance, a signature can be customized and then selected when the signature
is applied to the document.
Follow these steps to create a custom signature appearance using a graphic image:
1. Choose Edit > Preferences to open the Preferences dialog box; then choose Security from the
column on the left. The Appearance window at the top of the dialog box lists existing signature
appearances. Click New.