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

If [Certificate Verification] 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 with a device signature, by matching it with the MD5 or SHA-1 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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