Glossary
OCSP (Online Certificate Status Protocol)
OCSP is an internet protocol that enables real-time verification of whether a digital certificate has been revoked before its expiry date.
Full Definition
Instead of downloading a full Certificate Revocation List (CRL), the client sends a simple query to the CA's OCSP server: 'Is certificate No. X valid?'. OCSP responds with 'good', 'revoked' or 'unknown'. In long-term electronic signature archiving, the OCSP check is captured in the timestamp so that the certificate's validity at the time of signing can be proven decades later.
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