Which protocol is commonly used to provide encryption in transit for remote access?

• A. IPSec
• B. TLS
• C. PGP
• D. SSH

Answer: (D)

SSH provides an encrypted channel for remote access. It is designed specifically to secure interactive sessions, command execution, and file transfers between a client and a remote system, ensuring confidentiality, integrity, and authentication throughout the session. This makes it the go-to protocol for remotely managing servers or devices over an unsecured network.

Other protocols serve different purposes: IPSec is typically used to create VPN tunnels that protect IP traffic at the network layer, TLS secures application-layer connections like HTTPS, and PGP is aimed at end-to-end data encryption for email and files. While those have important roles in security, SSH is the standard for encryption in transit when you need secure remote administration and interactive access.