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Difficulty: Very hardInformation Technology and Cybersecurity

With reference to modern digital communication protocols and cryptographic security mechanisms, consider the following statements:

1. Perfect Forward Secrecy (PFS) ensures that the compromise of a long-term server private key does not reveal past session keys.
2. Quantum Key Distribution (QKD) relies on the principles of quantum mechanics, such that any attempt by an eavesdropper to measure the quantum state inherently alters it, revealing the intrusion.
3. In Zero Trust Architecture (ZTA), implicit trust is granted to user devices once they successfully pass perimeter firewall authentication within the internal network.

Which of the statements given above are correct?

  1. 1 and 2 onlyAnswer
  2. B
    2 and 3 only
  3. C
    1 and 3 only
  4. D
    1, 2 and 3

Answer

1 and 2 only
The option stating '1 and 2 only' is correct. Perfect Forward Secrecy ensures past session confidentiality despite private key compromise by employing ephemeral key exchange mechanisms. Quantum Key Distribution guarantees eavesdropping detection because observing quantum states inevitably alters them. Zero Trust Architecture systematically eliminates implicit trust based on network position, requiring continuous verification for every access attempt.

Step-by-Step Solution

1
Evaluate Statement 1 regarding Perfect Forward Secrecy (PFS).
Statement 1 is correct.
PFS generates unique session keys for every session using ephemeral key exchange algorithms (such as Ephemeral Diffie-Hellman). Therefore, even if an attacker later obtains the server's long-term private key, past recorded sessions cannot be decrypted.
2
Evaluate Statement 2 regarding Quantum Key Distribution (QKD).
Statement 2 is correct.
QKD leverages quantum mechanical properties (such as photon polarization states). According to quantum physics principles, any attempt to observe or eavesdrop on quantum key generation alters the quantum state, creating detectable transmission errors.
3
Evaluate Statement 3 regarding Zero Trust Architecture (ZTA).
Statement 3 is incorrect.
Zero Trust Architecture operates on the core axiom 'never trust, always verify'. Unlike traditional perimeter defense, ZTA assumes the internal network is untrusted and continuously verifies identity, context, and security posture for every access request.

Key Concept

Advanced Cryptographic Protocols and Zero Trust Security Architecture
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Topics

Information Technology and Cybersecurity

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