Which technology commonly uses certificates to establish encrypted communications and verify identities across networks?

Which technology commonly uses certificates to establish encrypted communications and verify identities across networks?

• A. Public Key Infrastructure
• B. Virtual Private Network
• C. Secure Sockets Layer
• D. Security Information and Event Management

Answer: (C)

The key idea is that SSL (and its successor TLS) is the protocol that uses certificates to both verify identities and establish encrypted communications across a network. In practice, when you connect to a secure site, the server presents a certificate issued by a trusted authority. The client checks the certificate’s validity and trust chain, and if trusted, uses the certificate’s public key as part of the handshake to agree on a shared session key. That session key then powers all the encrypted data exchange, so you get confidentiality and integrity while you can be confident who you’re talking to is who they claim to be. Public Key Infrastructure underpins this by issuing and managing those certificates, but it’s the SSL/TLS protocol that actually leverages certificates to create the secure channel. VPNs may also use certificates, but they’re focused on tunneling, not the universal mechanism for certificate-based authentication and encrypted communication. SIEM handles security data collection and analysis, not encryption or identity verification.

The key idea is that SSL (and its successor TLS) is the protocol that uses certificates to both verify identities and establish encrypted communications across a network. In practice, when you connect to a secure site, the server presents a certificate issued by a trusted authority. The client checks the certificate’s validity and trust chain, and if trusted, uses the certificate’s public key as part of the handshake to agree on a shared session key. That session key then powers all the encrypted data exchange, so you get confidentiality and integrity while you can be confident who you’re talking to is who they claim to be.

Public Key Infrastructure underpins this by issuing and managing those certificates, but it’s the SSL/TLS protocol that actually leverages certificates to create the secure channel. VPNs may also use certificates, but they’re focused on tunneling, not the universal mechanism for certificate-based authentication and encrypted communication. SIEM handles security data collection and analysis, not encryption or identity verification.