Question: Which of the following PKI message bodies, as specified for NF Instance certificate enrolment in a telecom network's authentication framework, is **NOT** primarily used for updating existing cryptographic keys?
Option 1: Key Update Request (KUR)
Option 2: Certification Response (CP)
Option 3: Initialization Request (IR)
Option 4: Confirmation (PKICONF)
Explanation: The question requires understanding of the roles of different PKI message bodies in the context of telecom network security, specifically NF Instance certificate enrolment. - Key Update Request (KUR) and its response are explicitly for updating keys. - Certification Response (CP) is primarily involved in responding to certification requests, not key updates. - Initialization Request (IR) initiates the enrolment process but isn't specifically about key updates. - Confirmation (PKICONF) could relate to various confirmations, potentially including key updates, but its scope can be broader. Given the focus on what is **NOT** primarily used for updating existing cryptographic keys, **Certification Response (CP)** stands out as the correct answer because it's more directly associated with the certification process rather than the update of existing keys.