reference: RFC 2560 - Section 4.2.2.2 Authorized Responders:
The key that signs a certificate’s status information need not be the
same key that signed the certificate. It is necessary however to
ensure that the entity signing this information is authorized to do
so. Therefore, a certificate’s issuer MUST either sign the OCSP
responses itself or it MUST explicitly designate this authority to
another entity.
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