CAS-004 Security Architecture Practice Question
An organization is concerned about quantum computer attacks on its current cryptographic infrastructure. Which of the following NIST-approved post-quantum cryptographic algorithms is designed for key encapsulation?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CRYSTALS-Kyber
CRYSTALS-Kyber is a key encapsulation mechanism (KEM) selected by NIST for post-quantum cryptography.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RSA-4096
Why it's wrong here
RSA is not post-quantum; it is vulnerable to quantum attacks.
- ✓
CRYSTALS-Kyber
Why this is correct
Correct NIST-selected KEM.
- ✗
ECDHE
Why it's wrong here
ECDHE is an elliptic curve Diffie-Hellman, not post-quantum.
- ✗
CRYSTALS-Dilithium
Why it's wrong here
Dilithium is a digital signature algorithm, not a KEM.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-005 exam.