When a digital certificate needs to be invalidated prior to its expiration, which of the following is updated to indicate that this certificate should no longer be trusted?
Certificate Signing Request (CSR)
Certificate Revocation List (CRL)
Online Certificate Status Protocol (OCSP)
Wildcard Certificate
A Certificate Revocation List (CRL) is a list of digital certificates that have been revoked by their issuing Certificate Authority (CA) before their scheduled expiration date. CAs maintain and periodically publish this list, which clients then use to verify that a certificate has not been compromised or otherwise invalidated. While the Online Certificate Status Protocol (OCSP) also checks revocation status, it is a protocol used for real-time queries about a single certificate, not the list that is updated. A Certificate Signing Request (CSR) is used to request a certificate, and a Wildcard Certificate is a specific type of certificate, not a revocation mechanism.
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