- 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.
Quick Answer
The answer is to use server-side encryption with AWS KMS customer managed keys (SSE-KMS). This solution directly meets the requirement to encrypt S3 data with customer managed key and automatic rotation because AWS KMS allows you to create and control your own customer managed key (CMK) and enables automatic annual key rotation with a single toggle, satisfying the security policy. Additionally, every use of the key is logged in AWS CloudTrail, providing the necessary audit trail of when the key was used and by which service. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of the difference between AWS managed keys, customer managed keys, and SSE-S3; a common trap is choosing SSE-S3, which lacks customer control and rotation, or SSE-KMS with an AWS managed key, which does not allow you to manage rotation. Remember the memory tip: "Customer managed key equals full control, annual rotation, and CloudTrail audit."
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.
- ✓
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.
- ✗
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.
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.
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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Security and Compliance — study guide chapter
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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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on CLF-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A healthcare company stores sensitive patient data in Amazon S3. The company must comply with a regulation that requires encryption keys to be rotated automatically every 12 months. The security team also needs to use IAM policies to control which users and roles can decrypt specific S3 objects. Which encryption solution should the company use for the S3 objects?
medium- A.Server-side encryption with customer-provided keys (SSE-C)
- ✓ B.Server-side encryption with AWS KMS managed keys (SSE-KMS) using a customer managed key
- C.Client-side encryption using the AWS Encryption SDK
- D.Server-side encryption with Amazon S3 managed keys (SSE-S3)
Why B: SSE-KMS with a customer managed key is correct because it allows automatic key rotation every 12 months (configurable via the AWS KMS console) and enables fine-grained access control through IAM policies and key policies. This meets both the regulatory rotation requirement and the security team's need to control decryption of specific S3 objects.
Variation 2. A company has a compliance policy requiring that all data at rest in Amazon S3 be encrypted with a key that is automatically rotated every year. The company wants to manage the encryption keys themselves, maintain control over access policies, and have AWS handle the key rotation automatically. Which AWS service should the company use?
medium- ✓ A.AWS Key Management Service (AWS KMS)
- B.AWS CloudHSM
- C.AWS Secrets Manager
- D.AWS Certificate Manager
Why A: AWS KMS allows you to create customer managed keys (CMKs) with automatic annual rotation enabled. You retain control over key policies and access permissions, while AWS handles the rotation of the key material. This satisfies the compliance requirement for encrypted data at rest in S3 with automatic yearly key rotation.
Variation 3. A financial services company stores confidential transaction records in Amazon S3. The company's compliance policy requires that all data at rest be encrypted using encryption keys that are under the company's full control. The keys must be automatically rotated every year. The company also needs a detailed audit trail of when each key was used and by which AWS principal. Which combination of AWS service and key type should the company use to meet these requirements?
medium- A.Use Amazon S3 server-side encryption with customer-provided keys (SSE-C) and store the keys in AWS Secrets Manager with automatic rotation enabled.
- B.Use Amazon S3 server-side encryption with AWS managed keys (SSE-S3) and enable automatic key rotation.
- C.Use AWS CloudHSM to generate and store the encryption keys, and configure an AWS Lambda function to rotate the keys every year and log usage to Amazon CloudWatch Logs.
- ✓ D.Use AWS Key Management Service (AWS KMS) with a customer managed key and enable automatic key rotation.
Why D: Option D is correct because AWS KMS with a customer managed key allows the company to maintain full control over the encryption keys, enable automatic annual rotation, and provides detailed CloudTrail audit logs for every key usage, including the AWS principal that made the request. This satisfies the compliance requirements for encryption at rest, key rotation, and audit trail.
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Last reviewed: Jun 11, 2026
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