- A
Use server-side encryption with S3 managed keys (SSE-S3).
Why wrong: SSE-S3 uses AWS-managed keys that cannot be rotated by the customer and do not provide a detailed audit trail of key usage via CloudTrail. While it provides encryption at rest, it does not meet the requirement for customer-managed key rotation and auditing.
- B
Use server-side encryption with AWS KMS customer managed keys (SSE-KMS).
SSE-KMS with a customer managed key (CMK) allows the company to create, manage, and rotate the key. Key usage is logged in AWS CloudTrail, providing the required audit trail. This is the correct solution.
- C
Use server-side encryption with customer-provided keys (SSE-C).
Why wrong: SSE-C requires the customer to supply the encryption key with each request, but Amazon S3 does not store the key. The customer must manage the key separately (e.g., rotation, storage), which does not align with the requirement to have S3 manage the key under the customer's control. Additionally, SSE-C does not provide built-in key rotation or integrated CloudTrail auditing for the key itself.
- D
Use client-side encryption with an AWS KMS managed key.
Why wrong: Client-side encryption encrypts data before it is sent to Amazon S3. The encryption key is managed by the client application, not by S3. While AWS KMS can be used as a key source, the encryption happens outside of S3, and the company is responsible for implementing encryption logic. This adds complexity and does not leverage S3's native server-side encryption capabilities.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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 stores sensitive financial data in Amazon S3. The company's security policy requires that all data be encrypted at rest using a key that the company creates and manages, with the ability to rotate the key annually. The company also needs an audit trail of when the key was used and by which AWS service. Which solution should the company use to meet these requirements?
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
Use server-side encryption with AWS KMS customer managed keys (SSE-KMS).
Option B is correct because SSE-KMS with a customer managed key (CMK) allows the company to create and manage its own encryption key, enable automatic annual key rotation via AWS KMS, and provides detailed CloudTrail audit logs of every KMS API call (e.g., Decrypt, GenerateDataKey) showing which AWS service or user used the key. This satisfies all stated requirements: customer-managed key, annual rotation, and audit trail.
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 server-side encryption with S3 managed keys (SSE-S3).
Why it's wrong here
SSE-S3 uses AWS-managed keys that cannot be rotated by the customer and do not provide a detailed audit trail of key usage via CloudTrail. While it provides encryption at rest, it does not meet the requirement for customer-managed key rotation and auditing.
When this WOULD be correct
A company needs server-side encryption at rest but has no requirement to manage the encryption keys or audit key usage; the security policy only mandates encryption with AWS handling key management.
- ✓
Use server-side encryption with AWS KMS customer managed keys (SSE-KMS).
Why this is correct
SSE-KMS with a customer managed key (CMK) allows the company to create, manage, and rotate the key. Key usage is logged in AWS CloudTrail, providing the required audit trail. This is the correct solution.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use server-side encryption with customer-provided keys (SSE-C).
Why it's wrong here
SSE-C requires the customer to supply the encryption key with each request, but Amazon S3 does not store the key. The customer must manage the key separately (e.g., rotation, storage), which does not align with the requirement to have S3 manage the key under the customer's control. Additionally, SSE-C does not provide built-in key rotation or integrated CloudTrail auditing for the key itself.
When this WOULD be correct
A company needs to encrypt data at rest in S3 but must maintain full control over the encryption keys and cannot use AWS KMS due to compliance or regulatory requirements, and does not need an audit trail of key usage.
- ✗
Use client-side encryption with an AWS KMS managed key.
Why it's wrong here
Client-side encryption encrypts data before it is sent to Amazon S3. The encryption key is managed by the client application, not by S3. While AWS KMS can be used as a key source, the encryption happens outside of S3, and the company is responsible for implementing encryption logic. This adds complexity and does not leverage S3's native server-side encryption capabilities.
When this WOULD be correct
A company needs to encrypt data before uploading to S3 and wants to use an AWS KMS managed key for client-side encryption, with no requirement for an audit trail of AWS service usage.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use server-side encryption with AWS KMS customer managed keys (SSE-KMS).Correct answer▾
Why this is correct
SSE-KMS with a customer managed key (CMK) allows the company to create, manage, and rotate the key. Key usage is logged in AWS CloudTrail, providing the required audit trail. This is the correct solution.
✗Use server-side encryption with S3 managed keys (SSE-S3).Wrong answer — click to see why▾
Why this is wrong here
SSE-S3 uses AWS-managed keys, not customer-managed keys, so the company cannot control key rotation or obtain an audit trail of key usage.
★ When this WOULD be the correct answer
A company needs server-side encryption at rest but has no requirement to manage the encryption keys or audit key usage; the security policy only mandates encryption with AWS handling key management.
Why candidates choose this
Candidates may confuse SSE-S3 with a managed encryption solution and overlook the specific requirements for customer-managed keys and audit trails.
✗Use server-side encryption with customer-provided keys (SSE-C).Wrong answer — click to see why▾
Why this is wrong here
SSE-C requires the customer to manage the encryption keys themselves, including key rotation and storage, and does not provide an integrated audit trail of key usage by AWS services.
★ When this WOULD be the correct answer
A company needs to encrypt data at rest in S3 but must maintain full control over the encryption keys and cannot use AWS KMS due to compliance or regulatory requirements, and does not need an audit trail of key usage.
Why candidates choose this
Candidates may think SSE-C satisfies the requirement for customer-managed keys and annual rotation, but overlook the need for an audit trail and the operational burden of managing keys outside AWS.
✗Use client-side encryption with an AWS KMS managed key.Wrong answer — click to see why▾
Why this is wrong here
Client-side encryption does not provide an audit trail of key usage by AWS services because encryption occurs before data reaches AWS, and AWS KMS is not used for server-side operations.
★ When this WOULD be the correct answer
A company needs to encrypt data before uploading to S3 and wants to use an AWS KMS managed key for client-side encryption, with no requirement for an audit trail of AWS service usage.
Why candidates choose this
Candidates may confuse client-side encryption with server-side encryption and think that using an AWS KMS managed key for client-side encryption still provides audit logs, but KMS audit logs only track API calls, not client-side operations.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse SSE-S3's 'AWS managed' keys with customer managed keys, or assume SSE-C's customer-provided keys satisfy the 'create and manage' requirement, overlooking the need for annual rotation and audit trail capabilities.
Detailed technical explanation
How to think about this question
AWS KMS customer managed keys support automatic annual rotation (enabled by default for new CMKs) and can also be rotated manually on demand. Each KMS API call is logged in AWS CloudTrail with fields like `eventSource` (e.g., s3.amazonaws.com), `eventName` (e.g., Decrypt), and `resources` containing the key ARN, enabling precise audit of which service used the key and when. SSE-C, by contrast, forces the customer to supply the raw key material in every request header, making it unsuitable for automated rotation and centralized auditing.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use server-side encryption with AWS KMS customer managed keys (SSE-KMS). — Option B is correct because SSE-KMS with a customer managed key (CMK) allows the company to create and manage its own encryption key, enable automatic annual key rotation via AWS KMS, and provides detailed CloudTrail audit logs of every KMS API call (e.g., Decrypt, GenerateDataKey) showing which AWS service or user used the key. This satisfies all stated requirements: customer-managed key, annual rotation, and audit trail.
What should I do if I get this CLF-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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Last reviewed: Jun 11, 2026
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