O
- Online Certificate Status Protocol (OCSP)
A protocol used to the check the status of certificates issued by a certification authority (CA). When a client receives a certificate, they can query an online responder to verify whether the certificate is valid. OCSP is used as an alternative to checking the certificate revocation list (CRL).
- online responder
A server running the Online Responder service that responds to Online Certificate Status Protocol (OCSP) status requests. The online responder receives OCSP status requests from clients querying about the status of a certificate. The online responder returns a response of "good," "revoked," or "unknown."
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