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What is the OCSP protocol used for?
To download the CRL
To check that a certificates is still valid (not revoked)
To check that a certificate is not expired
To request a server's certificate
OCSP (Online Certificate Status Protocol) is used to query the CA about the status of a certificate, to check that it's still valid (not revoked or suspended). It is an alternative to downloading the CRL, allowing clients to query the CA about the status of a specific certificate and obtain an answer on-line.
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