14 Encryption and Digital Signature Settings
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Configuration of Email Encryption/Digital
Signature
Installation Overview
To encrypt emails and attach a digital signature to emails between the device and a computer, a personal or
device certificate for S/MIME of a recipient and the device certificate of the device must be set on the
computer. To configure the digital signature, the device certificate of the device is necessary. Configure the
following settings to the certificates.
Email address
If the certificate contains V3 extension "keyUsage", "digitalSignature" and "keyEncipherment" must be
asserted.
If the certificate contains V3 extension "extendedKeyUsage", "emailProtection" must be set.
Up to 100 addresses can be encrypted with S/MIME.
Configuration on Sender and Recipient
To transmit emails encrypted by S/MIME and with digital signatures attached, register the
required certificate on equipment of a sender and a recipient.
The following shows the certificate settings necessary to encryption and digital signature.
Step 1 Certificate Arrangement
Prepare for the certificate used for encrypting the email communication and for making
the digital signature. To set up a certificate using CentreWare Internet Services, you can
have the device create a self-signed certificate for the SSL server or can import any
registered certificate (issued by another CA) to the device.
To Generating Self-Signed Certificate (for S/MIME)
1
Start CentreWare Internet Services and log in to the System Administration mode.
For details, refer to "Starting CentreWare Internet Services" (P.85).
2
Click [Details] located next to the device image on the top part of Home screen.
3
Confirm that [Device's Email Address] is input.
Sender Recipient Encryption Digital Signature
Certificate required for the
sender
Certificate to required for
the recipient
The device Computer Personal certificate of the
computer
Device certificate for S/MIME
of the device
Another device Device certificate for S/MIME
of another device
Device certificate for S/MIME
of the device
Computer The device Device certificate for S/MIME
of the device
Personal certificate of the
computer
Another device Device certificate for S/MIME
of the device
Device certificate for S/MIME
of another device