ITPEC FE Morning October 2018 Question 42
ITPEC FE Morning October 2018 — Question 42 of 80
PKI Certification Authority (CA) — role as a trusted third party
A CA (Certificate Authority) in PKI issues digital certificates that bind a public key to the identity of a user or server. This lets other parties trust that the public key truly belongs to the claimed entity.
Correct answer: d) It issues a digital certificate that certifies a public key of a user or a server.
Why not the others:
- a) Digital signatures on emails are created by the sender using their own private key — not by the CA.
- b) Time synchronization is the job of an NTP server, not a CA.
- c) A CA certifies the public key, never the private key. The private key stays secret with its owner and is never shared or certified.
Key rule: CA = certifies public keys via digital certificates. Private keys are never disclosed or certified by anyone.
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