Question

A web site is using a certificate. Users have recently been receiving errors from the web site indicating that the web site's certificate is revoked. What includes a list of certificates that have been revoked?

Answer 1

A list of certificates that have been revoked is maintained in a Certificate Revocation List (CRL) or can be checked in real-time using the Online Certificate Status Protocol (OCSP). Website administrators should verify the validity of the certificate to address the issue of revoked certificates.

Step-by-step explanation:

A list of certificates that have been revoked is maintained in a database called a Certificate Revocation List (CRL). The CRL contains information about certificates that have been revoked by the issuer before their expiration date.

Another mechanism used to maintain a list of revoked certificates is Online Certificate Status Protocol (OCSP). OCSP allows a client to request the revocation status of a specific certificate from the Certificate Authority (CA) in real-time.

To address the issue of revoked certificates on a website, the website administrator needs to check the validity of the certificate issued by the CA and ensure it has not been revoked.