Question: In a 5G Core Network utilizing Service Based Architecture (SBA), what is the recommended signature algorithm for Transport Layer Security (TLS) entity certificates among Network Functions (NFs), Service Communication Proxy (SCPs), and Security Edge Protection Proxies (SEPPs)?
Option 1: RSA with SHA-256
Option 2: AES Encryption with ECDSA
Option 3: HMAC-SHA-1 for IPSec
Option 4: Elliptic Curve Digital Signature Algorithm (ECDSA)
Explanation: The correct answer is ECDSA because, according to the specified security guidelines for SBA in a 5G Core Network, ECDSA is explicitly recommended for use with TLS entity certificates due to its efficiency and strong security properties, beneficial in the context of SBA's service-based interactions among NFs, SCPs, and SEPPs.