- A
Use SSE-S3 with the default Amazon-managed key for all uploads.
Why wrong: This provides encryption at rest, but the security team cannot directly control or quickly revoke the underlying key.
- B
Use SSE-KMS with a customer-managed AWS KMS key.
SSE-KMS with a customer-managed KMS key gives the security team explicit control over key policy, grants, auditing, and revocation. The application can upload objects normally while S3 handles encryption and decryption on the service side, so developers do not need custom cryptography code. If compromise is suspected, the key or grants can be disabled to block future access, which is exactly why a customer-managed key is preferable here.
- C
Encrypt objects on the client side and store the encryption key in the same S3 bucket.
Why wrong: Client-side encryption can work, but storing the key with the data defeats the purpose and makes operational control much harder.
- D
Use Amazon S3 replication to a second bucket in another region.
Why wrong: Replication improves availability and recovery options, but it does not by itself satisfy key-control or encryption-management requirements.
Quick Answer
The answer is SSE-KMS with a customer-managed AWS KMS key because it meets both security requirements: you control the encryption key and can instantly disable access by revoking or disabling that key, which immediately blocks all decryption attempts on the S3 objects. This solution offloads encryption entirely to the server side, so developers never need to manage encryption in application code. On the SAA-C03 exam, this scenario tests your understanding of the difference between SSE-S3, SSE-KMS, and SSE-C, with the common trap being that SSE-S3 does not give you key control and SSE-C requires application code changes. Remember that customer-managed keys give you full lifecycle control, including key rotation and disabling, while AWS-managed keys do not. Memory tip: think “C” in customer-managed stands for “Control” and “Cut off” access instantly.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 finance application stores invoices in Amazon S3. Security requires that the data be encrypted with a key they control, and they want the ability to disable access quickly if the application is suspected of compromise. Developers do not want to manage encryption in application code. Which solution best meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 SSE-KMS with a customer-managed AWS KMS key.
SSE-KMS with a customer-managed AWS KMS key meets the requirements because it allows the finance application to encrypt data at rest using a key that the customer controls, and it provides the ability to quickly disable access by revoking or disabling the KMS key, which immediately blocks any decryption attempts. The developers do not need to manage encryption in application code because encryption is handled server-side by S3 using the KMS key.
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 SSE-S3 with the default Amazon-managed key for all uploads.
Why it's wrong here
This provides encryption at rest, but the security team cannot directly control or quickly revoke the underlying key.
- ✓
Use SSE-KMS with a customer-managed AWS KMS key.
Why this is correct
SSE-KMS with a customer-managed KMS key gives the security team explicit control over key policy, grants, auditing, and revocation. The application can upload objects normally while S3 handles encryption and decryption on the service side, so developers do not need custom cryptography code. If compromise is suspected, the key or grants can be disabled to block future access, which is exactly why a customer-managed key is preferable here.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Encrypt objects on the client side and store the encryption key in the same S3 bucket.
Why it's wrong here
Client-side encryption can work, but storing the key with the data defeats the purpose and makes operational control much harder.
- ✗
Use Amazon S3 replication to a second bucket in another region.
Why it's wrong here
Replication improves availability and recovery options, but it does not by itself satisfy key-control or encryption-management requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SSE-S3 with customer-managed keys or think S3 replication provides security controls, but the key distinction is that only SSE-KMS with a customer-managed key gives you both customer-controlled keys and the ability to quickly revoke access without changing application code.
Detailed technical explanation
How to think about this question
When using SSE-KMS with a customer-managed key, S3 sends a GenerateDataKey request to AWS KMS for each upload, and the encrypted object is stored with the encrypted data key. To quickly disable access, you can use the DisableKey or ScheduleKeyDeletion API on the KMS key, which immediately prevents any new decryption requests, even if the IAM policy still allows s3:GetObject. This is more granular than S3 bucket policies or IAM, as it enforces a cryptographic block at the key level.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use SSE-KMS with a customer-managed AWS KMS key. — SSE-KMS with a customer-managed AWS KMS key meets the requirements because it allows the finance application to encrypt data at rest using a key that the customer controls, and it provides the ability to quickly disable access by revoking or disabling the KMS key, which immediately blocks any decryption attempts. The developers do not need to manage encryption in application code because encryption is handled server-side by S3 using the KMS key.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
This SAA-C03 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 SAA-C03 exam.
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