ITPEC FE Morning October 2023 Question 40
ITPEC FE Morning October 2023 — Question 40 of 80
PKI Certificate Authority (CA) role — what a CA does as a trusted third party in PKI.
A Certificate Authority (CA) is a trusted third party in a Public Key Infrastructure (PKI) that issues digital certificates binding a public key to the identity of a user or server. This allows others to trust that a given public key truly belongs to the claimed entity.
Why not others:
- (a) Adding a digital signature to an email is the user's own action (using their private key), not the CA's role.
- (b) Synchronization of time describes an NTP server, not a CA.
- (c) A CA certifies the public key, not the private key. The private key is never shared or certified — it stays secret with the owner.
Key rule: CA = issues certificates for public keys; private keys are never disclosed or certified.
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