A security analyst is reviewing the components of their organization's Public Key Infrastructure (PKI). Which of the following statements best describes the primary security function of a Certificate Revocation List (CRL) within this architecture?
To map user identities to their public keys
To store backup copies of all issued certificates
To identify certificates that should no longer be trusted
To validate the authenticity of certificate authorities
The correct answer is To identify certificates that should no longer be trusted. A Certificate Revocation List (CRL) is a list of digital certificates that have been revoked by the issuing Certificate Authority (CA) before their scheduled expiration date. Its primary function is to provide a mechanism for relying parties to check if a certificate is still valid and trustworthy.
To store backup copies of all issued certificates is incorrect. Certificate storage is typically handled by a certificate database or a central directory, not the CRL.
To validate the authenticity of certificate authorities is incorrect. The authenticity of a CA is established through a chain of trust that terminates at a trusted root CA certificate stored by the client, not through a CRL.
To map user identities to their public keys is incorrect. This is the primary function of the digital certificate itself, which binds an identity to a public key. The CRL deals with the status of that binding, not its creation.
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ISC2 CISSP
Security Architecture and Engineering
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