- A
Confidentiality
Why wrong: HMAC does not encrypt the message; it only provides authentication.
- B
Non-repudiation
Why wrong: Non-repudiation typically requires digital signatures, not symmetric HMAC.
- C
Integrity and authentication using a shared secret
HMAC ensures the message has not been altered and verifies the sender's possession of the secret key.
- D
Forward secrecy
Why wrong: Forward secrecy relates to key exchange, not HMAC.
Question 329 of 1,000
SSCP Cryptography Practice Question
This SSCP practice question tests your understanding of cryptography. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security auditor reviews a system that uses HMAC-SHA256 for message authentication. Which property does HMAC provide that a simple hash of the message does not?
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
✓
Integrity and authentication using a shared secret
HMAC-SHA256 uses a shared secret key combined with the message before hashing, which provides both integrity (detecting tampering) and authentication (verifying the sender knows the secret). A simple hash of the message alone offers integrity but no authentication, because anyone can compute the same hash without a secret. Thus, HMAC adds authentication via the shared secret, making option C correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Confidentiality
Why it's wrong here
HMAC does not encrypt the message; it only provides authentication.
- ✗
Non-repudiation
Why it's wrong here
Non-repudiation typically requires digital signatures, not symmetric HMAC.
- ✓
Integrity and authentication using a shared secret
Why this is correct
HMAC ensures the message has not been altered and verifies the sender's possession of the secret key.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Forward secrecy
Why it's wrong here
Forward secrecy relates to key exchange, not HMAC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse integrity (provided by any hash) with authentication (which requires a shared secret), leading them to think a simple hash is sufficient for message authentication, but HMAC specifically adds the keyed property.
Detailed technical explanation
How to think about this question
HMAC is defined in RFC 2104 and uses a two-step hashing process: inner hash (key XOR ipad || message) and outer hash (key XOR opad || inner hash). This construction prevents length-extension attacks that plague plain SHA-256 when used with a secret prefix. In real-world scenarios, HMAC is used in TLS record authentication and AWS Signature V4, where the shared secret ensures only parties with the key can generate valid tags.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SSCP question test?
Cryptography — This question tests Cryptography — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Integrity and authentication using a shared secret — HMAC-SHA256 uses a shared secret key combined with the message before hashing, which provides both integrity (detecting tampering) and authentication (verifying the sender knows the secret). A simple hash of the message alone offers integrity but no authentication, because anyone can compute the same hash without a secret. Thus, HMAC adds authentication via the shared secret, making option C correct.
What should I do if I get this SSCP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
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