Which of the following is an infrastructure system that allows the secure exchange of data over an unsecured network?

Question

Options

• APMK
• BPTK
• CPKI
• DGTK

• A
  4% (2)
• B
  2% (1)
• C
  94% (46)

Explanation

PKI (Public Key Infrastructure) is the correct answer because it is a complete framework - comprising certificate authorities, digital certificates, and key management - that enables secure data exchange over untrusted networks like the internet through asymmetric encryption and identity verification.

Why the distractors are wrong:

• A. PMK (Pairwise Master Key) - a cryptographic key derived during Wi-Fi authentication (e.g., WPA2); it's a key type, not an infrastructure system.
• B. PTK (Pairwise Transient Key) - derived from the PMK during the 4-way handshake in WPA2; again a session key, not an infrastructure system.
• D. GTK (Group Temporal Key) - used for broadcast/multicast traffic in Wi-Fi networks; also a key type, not an infrastructure system.

Memory tip: The word Infrastructure in "Public Key Infrastructure" maps directly to the question asking for an infrastructure system. PMK, PTK, and GTK all end in "Key" - they are individual keys, not systems. If the question asks for a system or framework, look for the option ending in "Infrastructure."

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