CAS-004 Security Architecture Practice Question
To protect against quantum computing attacks, a security architect is planning to transition to post-quantum cryptography. Which algorithm has been selected by NIST for general encryption (key encapsulation) in the PQC standard?
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
NIST selected CRYSTALS-Kyber for key encapsulation (encryption) and CRYSTALS-Dilithium for digital signatures.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Falcon
Why it's wrong here
Falcon is also a signature scheme.
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CRYSTALS-Dilithium
Why it's wrong here
Dilithium is for digital signatures, not encryption.
- ✓
CRYSTALS-Kyber
Why this is correct
Correct – Kyber is the key encapsulation mechanism.
- ✗
SPHINCS+
Why it's wrong here
SPHINCS+ is a stateless hash-based signature scheme.
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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.