The answer is to use AWS KMS with a customer-managed key (CMK) and enable automatic key rotation. This solution directly meets the requirement for customer-provided encryption keys stored securely in AWS, while the built-in automatic key rotation feature handles the 90-day rotation cycle without manual intervention. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of the three S3 encryption options: SSE-S3 uses Amazon-managed keys with automatic rotation but fails the customer-provided requirement, SSE-C lets you provide keys but offers no automatic rotation, and CloudHSM requires manual key management. The common trap is confusing SSE-S3’s automatic rotation with customer control—remember that only a customer-managed KMS key gives you both ownership and automated rotation. Memory tip: “CMK = Customer Managed + Key rotation” — if you need to provide the key and rotate it automatically, KMS CMK is the only path.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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 needs to encrypt data at rest in Amazon S3 using customer-provided encryption keys. The keys must be stored securely and rotated automatically every 90 days. Which solution meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS KMS with a customer-managed key (CMK) and enable automatic key rotation.
Option C is correct because AWS KMS with customer-managed keys (CMK) allows automatic key rotation every 90 days (or yearly if managed by KMS). Option A is wrong because SSE-S3 uses Amazon-managed keys with automatic rotation of 90 days, but the keys are not customer-provided. Option B is wrong because SSE-C requires customers to provide keys but does not offer automatic rotation. Option D is wrong because CloudHSM requires manual key rotation.
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.
✗
Use SSE-C and upload new keys to S3 every 90 days.
Why it's wrong here
SSE-C requires manual key rotation; no automatic rotation.
✓
Use AWS KMS with a customer-managed key (CMK) and enable automatic key rotation.
Why this is correct
KMS CMKs support automatic rotation every 90 days (or yearly).
Related concept
Read the scenario before looking for a memorised answer.
✗
Use SSE-S3 and enable automatic key rotation in the S3 bucket properties.
Why it's wrong here
SSE-S3 uses Amazon-managed keys; customers do not provide the keys.
✗
Use AWS CloudHSM and generate a new key every 90 days via a custom script.
Why it's wrong here
CloudHSM does not provide automatic rotation; manual process required.
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.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS KMS with a customer-managed key (CMK) and enable automatic key rotation. — Option C is correct because AWS KMS with customer-managed keys (CMK) allows automatic key rotation every 90 days (or yearly if managed by KMS). Option A is wrong because SSE-S3 uses Amazon-managed keys with automatic rotation of 90 days, but the keys are not customer-provided. Option B is wrong because SSE-C requires customers to provide keys but does not offer automatic rotation. Option D is wrong because CloudHSM requires manual key rotation.
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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