This DVA-C02 practice question tests your understanding of security. 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 wants to encrypt data at rest in an S3 bucket using server-side encryption. Which option provides the MOST control over the encryption key?
SSE-KMS (AWS KMS keys)
Why wrong: KMS gives control but not as much as SSE-C.
SSE-C (customer-provided keys)
The customer provides and manages the encryption keys.
Client-side encryption
Why wrong: This is not server-side encryption.
SSE-S3 (S3-managed keys)
Why wrong: AWS manages the keys.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SSE-C (customer-provided keys)
SSE-C (customer-provided keys) gives you the most control because you manage the encryption key yourself—you provide the key in each request, and AWS discards it after use. This means you have full lifecycle control over the key material, including rotation, deletion, and access policies, without AWS ever storing the key. In contrast, SSE-KMS and SSE-S3 rely on AWS-managed or AWS-controlled key stores, reducing your direct control.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
SSE-KMS (AWS KMS keys)
Why it's wrong here
KMS gives control but not as much as SSE-C.
SSE-C (customer-provided keys)
Why this is correct
The customer provides and manages the encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
Client-side encryption
Why it's wrong here
This is not server-side encryption.
SSE-S3 (S3-managed keys)
Why it's wrong here
AWS manages the keys.
Common exam traps
The trap here is that candidates confuse 'most control' with 'easiest management' and pick SSE-KMS, but the question explicitly asks for the option that provides the MOST control over the encryption key, which is SSE-C because you own and manage the key entirely.
Detailed technical explanation
Under the hood, SSE-C requires you to include the `x-amz-server-side-encryption-customer-key` header with a raw 256-bit AES key in every PUT/GET request; AWS uses the key to encrypt/decrypt the object in memory and then discards it, never persisting it. This means you must manage key distribution and rotation yourself, which is ideal for regulatory environments requiring exclusive key custody (e.g., PCI DSS or HIPAA with strict key separation). A subtle behavior: if you lose the key, the object is permanently unrecoverable, unlike SSE-KMS where AWS can still decrypt with proper permissions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: SSE-C (customer-provided keys) — SSE-C (customer-provided keys) gives you the most control because you manage the encryption key yourself—you provide the key in each request, and AWS discards it after use. This means you have full lifecycle control over the key material, including rotation, deletion, and access policies, without AWS ever storing the key. In contrast, SSE-KMS and SSE-S3 rely on AWS-managed or AWS-controlled key stores, reducing your direct control.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DVA-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 DVA-C02 exam.
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