4. Using the shared key, encrypt the e-mail message.
5. The shared key is encrypted using the user's public key.
6. The encrypted e-mail is sent.
7. The receiver decrypts the shared key using a secret key that corresponds to the public key.
8. The e-mail is decrypted using the shared key.
• There are three types of user certificates that can be installed on this machine, "DER encoded binary
X.509", "Base 64 encoded X.509", and "PKCS #7 certificate".
• When installing a user certificate to the Address Book using Web Image Monitor, you might see an
error message if the certificate file contains more than one certificate. If this error message appears,
install the certificates one at a time.
Specifying the User Certificate
This can be specified by the user administrator.
Each user certificate must be prepared in advance.
1. Open a Web browser.
2. Enter "http://(the machine's IP address or host name)/" in the address bar.
3. Click [Login].
The user administrator can log in.
Enter the login user name and login password.
4. Click [Address Book].
5. Select the user for whom the certificate will be installed, and then click [Change].
6. Enter the user address in the "E-mail Address" field under "E-mail".
7. Click [Change] in "User Certificate".
8. Click [Browse], select the user certificate file, and then click [Open].
9. Click [OK].
10. Click [OK].
11. Click [Logout].
Specifying the Encryption Algorithm
This can be specified by the network administrator.
1. Open a Web browser.
2. Enter "http://(the machine's IP address or host name)/" in the address bar.
5. Securing Information Sent over the Network or Stored on Hard Disk
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