Using CA-issued Key Pairs and Digital Certificates
Key pairs and digital certificates can be obtained from a certification authority (CA) for use with the machine. You can store and then register these files by using the Remote UI. Make sure that the key pair and the certificate satisfy the requirements of the machine (Key and Certificate Requirements). Up to five key pairs and three CA certificates can be registered.
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Display the screen for AirPrint. Displaying the Screen for AirPrint
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Click [Key and Certificate Settings].
If the screen for AirPrint is not displayed, or if you want to specify the CA certificate settings
Log on to the Remote UI in System Manager Mode (Starting Remote UI) 
[Settings/Registration] [Security Settings] [Key and Certificate Settings] (for key pairs) or [CA Certificate Settings] (for CA certificates).
[Settings/Registration] [Security Settings] [Key and Certificate Settings] (for key pairs) or [CA Certificate Settings] (for CA certificates). 3
Click [Register Key and Certificate] or [Register CA Certificate].
Deleting a registered key pair or CA certificate
Click [Delete] on the right of the key pair or CA certificate you want to delete click [OK]. You cannot delete the preinstalled CA certificates.
click [OK]. You cannot delete the preinstalled CA certificates."TLS" is displayed for a currently used key pair, and the key pair cannot be deleted. In this case, disable the function or replace the key pair before deleting it.
Disabling or enabling the preinstalled CA certificates
Click [Disable] on the right of the preinstalled CA certificate you want to disable. To enable the certificate again, click [Enable] on the right of the certificate.
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Click [Install...].
Deleting a key pair or CA certificate
Click [Delete] on the right of the file you want to delete, and then click [OK].
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Click [Choose File], specify the file to install, and click [Start Installation].
The key pair or CA certificate is installed in the machine.
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Register the key pair or CA certificate.
Registering a key pair
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Click [Register] on the right of the key pair you want to register.
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Enter the name of the key pair and password, and then click [OK].
 [Key Name]
Enter up to 24 alphanumeric characters for the name of the key pair to be registered.
[Password]
Enter up to 24 alphanumeric characters for the password of the private key set for the file to be registered.
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Registering a CA certificate
Click [Register] on the right of the CA certificate you want to register.
