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The following procedure describes how the administrator can confirm a key pair and device certificate generated/updated in "Setting a Key Pair and Device Certificate."

• For information on how a general user can check the device certificate, see "Confirming the Device Signature Certificate."

1. Press (Settings/Registration) → [Management Settings] → [Device Management] → [Certificate Settings] → [Key and Certificate List] → [Key and Certificate List for This Device].

[Key and Certificate List for This Device] and [Key and Certificate List for Users] appear if User Signature is activated.

If (invalid) is displayed to the left of a key pair, the key pair is corrupted or invalid. Follow the procedure in "Setting a Key Pair and Device Certificate," to generate/update a key pair.

• You cannot delete or edit a key pair necessary for a device signature on the Key and Certificate List for This Device screen.

2. Select 'Device Signature Key' → press [Certificate Details] → [Certificate].

If [Certificate] is grayed out or <The key is corrupted or invalid.> is displayed, you cannot use the key pair. Follow the procedure in "Setting a Key Pair and Device Certificate," to generate/update a new key pair.

• <Certificate Thumbprint> contains sender information used to validate the reliability of a PDF or XPS file with a device signature, by matching it with the SHA1 message digest number.

• The expiration date for the device signature is set to 5 years after its key pair was generated/updated.

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