The answer is to use SSE-KMS with a customer managed key and enable automatic key rotation. This is correct because SSE-KMS inherently implements envelope encryption, where a customer master key (CMK) encrypts a unique data key, and that data key encrypts the S3 object; enabling automatic key rotation on the CMK ensures a new backing key is generated every 90 days without any manual intervention, satisfying both the encryption and rotation requirements with minimal operational overhead. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding that SSE-KMS is the only S3 encryption option that supports both envelope encryption and configurable automatic key rotation, while SSE-S3 and SSE-C do not offer customer-controlled rotation. A common trap is assuming SSE-S3 with default rotation works, but that rotation is managed entirely by AWS and cannot be set to a custom 90-day schedule. Memory tip: “KMS rotates, S3 encrypts twice” — the CMK wraps the data key, and the data key wraps the object.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 ensure that data in Amazon S3 is encrypted at rest using envelope encryption. The company wants to rotate the encryption key every 90 days. Which solution meets these requirements with minimal operational overhead?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use SSE-KMS with a customer managed key and enable automatic key rotation
Option D is correct because SSE-KMS with a customer managed key (CMK) supports automatic key rotation, which can be configured to rotate the CMK every 90 days (or any custom period between 90 days and 7 years). This satisfies the envelope encryption requirement (SSE-KMS uses envelope encryption by default, where a CMK encrypts a data key that encrypts the S3 object) and the 90-day rotation requirement with minimal operational overhead, as AWS handles the rotation automatically.
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-KMS with AWS managed key
Why it's wrong here
AWS managed keys do not allow customer-controlled rotation.
✗
Use SSE-S3 and enable automatic key rotation
Why it's wrong here
SSE-S3 does not support customer key rotation.
✗
Use SSE-C and rotate the customer-provided key every 90 days
Why it's wrong here
SSE-C requires manual key management and is not minimal overhead.
✓
Use SSE-KMS with a customer managed key and enable automatic key rotation
Why this is correct
KMS can automatically rotate customer managed keys annually; for 90-day rotation, manual rotation is needed but still minimal overhead.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS managed keys (which have a fixed 365-day rotation) with customer managed keys (which allow custom rotation periods), leading them to incorrectly choose Option A.
Detailed technical explanation
How to think about this question
Envelope encryption in AWS KMS works by using a CMK to generate, encrypt, and decrypt data keys; the data key is used to encrypt the S3 object, and the encrypted data key is stored alongside the object. When automatic key rotation is enabled for a customer managed CMK, AWS KMS creates new cryptographic material for the CMK each rotation period, but the old material remains available for decrypting existing objects, ensuring seamless access. A real-world scenario where this matters is compliance with regulations like PCI DSS or HIPAA, which may require cryptographic key rotation every 90 days, and using a customer managed CMK with automatic rotation meets this without manual intervention.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 SSE-KMS with a customer managed key and enable automatic key rotation — Option D is correct because SSE-KMS with a customer managed key (CMK) supports automatic key rotation, which can be configured to rotate the CMK every 90 days (or any custom period between 90 days and 7 years). This satisfies the envelope encryption requirement (SSE-KMS uses envelope encryption by default, where a CMK encrypts a data key that encrypts the S3 object) and the 90-day rotation requirement with minimal operational overhead, as AWS handles the rotation automatically.
What should I do if I get this SCS-C02 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.
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Question Discussion
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