The answer is AWS Key Management Service (AWS KMS), which is the correct choice for centralized encryption key management for S3 data at rest. AWS KMS provides a fully managed, highly available service to create, control, and rotate encryption keys, integrating directly with Amazon S3 to enforce server-side encryption (SSE-KMS) across all objects. This centralizes key policies, auditing via AWS CloudTrail, and access control through IAM, ensuring consistent governance without managing hardware. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your ability to distinguish between services that manage keys versus those that store secrets or certificates—a common trap is confusing CloudHSM (which offers dedicated hardware but lacks centralized key management) with KMS. Remember the memory tip: KMS is the “key master” for S3 encryption, while CloudHSM is the “hardware helper” for compliance.
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company wants to encrypt data at rest in an Amazon S3 bucket. Which AWS service can centrally manage the encryption keys?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Key Management Service (AWS KMS)
Option B is correct because AWS KMS is the managed service for creating and controlling encryption keys used to encrypt data. Option A is wrong because AWS CloudHSM provides hardware security modules but not central key management. Option C is wrong because AWS Secrets Manager is for managing secrets, not encryption keys for S3. Option D is wrong because AWS Certificate Manager manages SSL/TLS certificates, not encryption keys for data at rest.
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.
✗
AWS CloudHSM
Why it's wrong here
CloudHSM provides dedicated hardware security modules but does not centrally manage keys as a service; it's more for custom key management.
✗
AWS Certificate Manager (ACM)
Why it's wrong here
ACM manages SSL/TLS certificates, not data encryption keys.
✓
AWS Key Management Service (AWS KMS)
Why this is correct
AWS KMS is a managed service for creating and controlling encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Secrets Manager
Why it's wrong here
Secrets Manager is for managing secrets like database credentials, not encryption keys for S3.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which SCS-C02 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.
Infrastructure Security — This question tests Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Key Management Service (AWS KMS) — Option B is correct because AWS KMS is the managed service for creating and controlling encryption keys used to encrypt data. Option A is wrong because AWS CloudHSM provides hardware security modules but not central key management. Option C is wrong because AWS Secrets Manager is for managing secrets, not encryption keys for S3. Option D is wrong because AWS Certificate Manager manages SSL/TLS certificates, not encryption keys for data at rest.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 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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This SCS-C02 practice question is part of Courseiva's free Amazon Web Services 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 SCS-C02 exam.
Question Discussion
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