- A
Server-Side Encryption with AWS KMS (SSE-KMS)
Correct. SSE-KMS allows you to use a customer-managed CMK, giving you control over the key lifecycle and compliance with the policy requiring company-managed keys.
- B
Server-Side Encryption with S3-Managed Keys (SSE-S3)
Why wrong: Incorrect. SSE-S3 uses AWS-managed keys, which does not satisfy the requirement that keys be managed by the company.
- C
Server-Side Encryption with Customer-Provided Keys (SSE-C)
Correct. SSE-C requires you to provide your own encryption key with each request, meeting the requirement of company-managed keys for server-side encryption.
- D
Client-Side Encryption
Why wrong: Incorrect. Client-Side Encryption encrypts data before it reaches S3, which is not server-side encryption. The policy specifically requires encryption at rest in S3, which is server-side, and client-side encryption does not use S3 server-side encryption.
Using SSE-C for Customer-Managed Encryption Keys in Amazon S3
This SOA-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's security policy requires that all data stored in Amazon S3 must be encrypted at rest using keys managed by the company. Which encryption option should the SysOps administrator choose?
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
Server-Side Encryption with AWS KMS (SSE-KMS)
Both options A (SSE-KMS) and C (SSE-C) meet the requirement because both allow the company to manage the encryption keys. With SSE-KMS, you can use a customer-managed customer master key (CMK) in AWS KMS, giving you control over key rotation and access. With SSE-C, you provide your own encryption key in each request, and S3 performs encryption and then discards the key. SSE-C is more cumbersome, so SSE-KMS with a customer-managed CMK is typically the preferred approach. Options B (SSE-S3) uses AWS-managed keys, and D (Client-Side Encryption) encrypts data before sending to S3, but the requirement is for server-side encryption with company-managed keys.
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.
- ✓
Server-Side Encryption with AWS KMS (SSE-KMS)
Why this is correct
Correct. SSE-KMS allows you to use a customer-managed CMK, giving you control over the key lifecycle and compliance with the policy requiring company-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Server-Side Encryption with S3-Managed Keys (SSE-S3)
Why it's wrong here
Incorrect. SSE-S3 uses AWS-managed keys, which does not satisfy the requirement that keys be managed by the company.
- ✓
Server-Side Encryption with Customer-Provided Keys (SSE-C)
Why this is correct
Correct. SSE-C requires you to provide your own encryption key with each request, meeting the requirement of company-managed keys for server-side encryption.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Client-Side Encryption
Why it's wrong here
Incorrect. Client-Side Encryption encrypts data before it reaches S3, which is not server-side encryption. The policy specifically requires encryption at rest in S3, which is server-side, and client-side encryption does not use S3 server-side encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates may think only SSE-C allows customer-managed keys, forgetting that SSE-KMS with a customer-managed CMK also meets the requirement. Both options satisfy the policy.
Detailed technical explanation
How to think about this question
SSE-C works by requiring the client to include the encryption key in the `x-amz-server-side-encryption-customer-key` header of each PUT or GET request. S3 uses the key to encrypt the object upon write and decrypt it upon read, but does not store the key; the customer is responsible for key management and secure transmission. A subtle behavior is that SSE-C objects cannot be accessed via the S3 console or cross-account without providing the key, and they are not compatible with S3 features like versioning or replication without additional key management overhead.
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.
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FAQ
Questions learners often ask
What does this SOA-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: Server-Side Encryption with AWS KMS (SSE-KMS) — Both options A (SSE-KMS) and C (SSE-C) meet the requirement because both allow the company to manage the encryption keys. With SSE-KMS, you can use a customer-managed customer master key (CMK) in AWS KMS, giving you control over key rotation and access. With SSE-C, you provide your own encryption key in each request, and S3 performs encryption and then discards the key. SSE-C is more cumbersome, so SSE-KMS with a customer-managed CMK is typically the preferred approach. Options B (SSE-S3) uses AWS-managed keys, and D (Client-Side Encryption) encrypts data before sending to S3, but the requirement is for server-side encryption with company-managed keys.
What should I do if I get this SOA-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: Jul 4, 2026
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