The answer is AWS Key Management Service (KMS). This is the correct choice because KMS is a fully managed service that provides centralized key creation, management, rotation, and audit logging for encryption keys used across AWS services, integrating natively with services like S3, EBS, and RDS to encrypt data at rest and supporting TLS/SSL for data in transit. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of which service handles the entire key lifecycle under a compliance framework, often appearing as a straightforward scenario where you must distinguish KMS from related services like CloudHSM or AWS Certificate Manager. A common trap is confusing KMS with CloudHSM, but remember that KMS is the managed, integrated choice for most compliance needs, while CloudHSM offers dedicated hardware for stricter regulatory environments. Memory tip: KMS = Key Management Service, and the “M” stands for “Managed” — meaning AWS handles rotation and auditing for you.
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 is required by their compliance framework to encrypt all data at rest and in transit. Which AWS service provides centralized key creation, management, rotation, and audit logging for encryption keys used across AWS services?
Why wrong: Secrets Manager stores and rotates application secrets — it uses KMS for encryption but is not itself the key management service.
B
AWS CloudHSM
Why wrong: CloudHSM provides dedicated HSMs for custom key management — KMS is the managed service that most customers use, with CloudHSM for specialized compliance requirements.
C
AWS Key Management Service (KMS)
KMS provides centralized cryptographic key management with automatic rotation, HSM-backed key storage, fine-grained IAM access control, and CloudTrail audit logging for all key operations.
D
Amazon Macie
Why wrong: Macie discovers sensitive data in S3 — it uses KMS for encryption but is not a key management service.
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 (KMS)
AWS Key Management Service (KMS) is the correct choice because it is a fully managed service that provides centralized control over encryption keys, including creation, rotation, and audit logging via AWS CloudTrail. It integrates seamlessly with other AWS services (e.g., S3, EBS, RDS) to encrypt data at rest and supports TLS/SSL for data in transit, meeting compliance requirements for key lifecycle management.
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 Secrets Manager
Why it's wrong here
Secrets Manager stores and rotates application secrets — it uses KMS for encryption but is not itself the key management service.
✗
AWS CloudHSM
Why it's wrong here
CloudHSM provides dedicated HSMs for custom key management — KMS is the managed service that most customers use, with CloudHSM for specialized compliance requirements.
✓
AWS Key Management Service (KMS)
Why this is correct
KMS provides centralized cryptographic key management with automatic rotation, HSM-backed key storage, fine-grained IAM access control, and CloudTrail audit logging for all key operations.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon Macie
Why it's wrong here
Macie discovers sensitive data in S3 — it uses KMS for encryption but is not a key management service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS Secrets Manager's secret rotation capability with encryption key management, but Secrets Manager does not create or manage encryption keys—it relies on KMS for that purpose.
Detailed technical explanation
How to think about this question
Under the hood, KMS uses FIPS 140-2 validated hardware security modules (HSMs) to protect key material, and it supports customer master keys (CMKs) that can be either AWS managed or customer managed. Key rotation can be automatic (yearly for AWS managed keys) or on-demand for customer managed keys, with each rotation creating a new backing key while retaining the same key ID for seamless decryption of older data. In a real-world scenario, a company using S3 server-side encryption (SSE-KMS) can enforce compliance by enabling automatic key rotation and auditing all key usage via CloudTrail logs, which capture every Decrypt and GenerateDataKey call.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
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: AWS Key Management Service (KMS) — AWS Key Management Service (KMS) is the correct choice because it is a fully managed service that provides centralized control over encryption keys, including creation, rotation, and audit logging via AWS CloudTrail. It integrates seamlessly with other AWS services (e.g., S3, EBS, RDS) to encrypt data at rest and supports TLS/SSL for data in transit, meeting compliance requirements for key lifecycle management.
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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