The answer is Intel Software Guard Extensions (SGX) because it provides hardware-based memory encryption that isolates sensitive code and data within secure enclaves, directly protecting data in use from other processes running on the same server. Unlike TPM, which focuses on attestation and key storage, or an HSM dedicated to cryptographic operations, SGX encrypts memory pages at the CPU level so that even the operating system or hypervisor cannot access the enclave’s contents. On the CompTIA SecurityX CAS-004 exam, this question tests your ability to distinguish between hardware security technologies for different trust boundaries—a common trap is confusing SGX with TPM or Secure Boot, which address boot integrity and remote attestation rather than runtime memory isolation. Remember the mnemonic “SGX = Secure Guard for eXecution” to recall that it protects data actively being processed, not data at rest or in transit.
CAS-004 Security Engineering Practice Question
This CAS-004 practice question tests your understanding of security engineering. 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 architect needs to protect sensitive data in use within a server's memory from other processes. Which technology should be implemented?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Intel Software Guard Extensions (SGX)
Intel SGX provides hardware-based memory encryption that isolates code and data in enclaves, protecting data in use from other processes. TPM is for attestation and key storage, HSM for dedicated cryptographic operations, and Secure Boot for boot integrity.
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.
✗
Secure Boot
Why it's wrong here
Secure Boot ensures only signed firmware and OS loaders execute but does not protect runtime memory.
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Trusted Platform Module (TPM)
Why it's wrong here
TPM is used for hardware-based key storage and attestation, not for protecting data in memory during runtime.
✓
Intel Software Guard Extensions (SGX)
Why this is correct
SGX creates secure enclaves in memory, protecting data in use from other processes and the host OS.
Related concept
Read the scenario before looking for a memorised answer.
✗
Hardware Security Module (HSM)
Why it's wrong here
HSM provides secure cryptographic processing and key storage but does not protect data in use within general memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Security Engineering — This question tests Security Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Intel Software Guard Extensions (SGX) — Intel SGX provides hardware-based memory encryption that isolates code and data in enclaves, protecting data in use from other processes. TPM is for attestation and key storage, HSM for dedicated cryptographic operations, and Secure Boot for boot integrity.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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