Unknown

The revocation reason does not match any of the predefined reasons.

Key Compromise

A person who is not the key subject might have discovered the private key value.

CA Compromise

Someone might have revealed the private key of the certificate issuer.

Change in Affiliation

The certificate subject no longer works for the organisation.

Superseded

A new certificate is replacing an existing certificate.

Cessation of Operation

The certificate subject no longer requires the certificate.

Certificate Hold

You want to revoke the certificate temporarily.