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3. Ensuring Information Security
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
3
X.509", "Base 64 encoded X.509", and "PKCS #7 certificate".
• When installing a user certificate to the Address Book using Web Image Monitor, an error message
appears if the certificate file contains more than one certificates. In such cases, install one certificate
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.
When entering an IPv4 address, do not begin segments with zeros. For example: If the address is
"192.168.001.010", you must enter it as "192.168.1.10" to connect to the machine.
The top page of Web Image Monitor appears.
3.
Click [Login].
The user administrator can log on.
Enter the login user name and login password.
4.
Click [Address Book].
The Address Book page appears.
5.
Select the user for whom the certificate will be installed, and then click [Change].
The Change User Information screen appears.
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].
The user certificate is installed.
10.
Click [OK].
11.
Click [Logout].
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