This CCSP practice question tests your understanding of cloud data 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 uses a cloud storage service to store sensitive customer data. They need to ensure that data is encrypted at rest using keys managed by the cloud provider. Which encryption model should they use?
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 S3-Managed Keys (SSE-S3)
The requirement specifies that the cloud provider manages the encryption keys. SSE-S3 uses keys that are entirely managed by AWS (S3) for encrypting data at rest, with each object encrypted by a unique key that is itself encrypted by a regularly rotated master key. This aligns perfectly with the scenario where the customer does not want to manage 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 S3-Managed Keys (SSE-S3)
Why this is correct
SSE-S3 uses cloud provider-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Server-Side Encryption with AWS KMS (SSE-KMS)
Why it's wrong here
SSE-KMS uses AWS KMS which is a managed service but the customer creates and manages the CMK.
✗
Client-Side Encryption (CSE)
Why it's wrong here
CSE is performed by the client, not the cloud provider.
✗
Server-Side Encryption with Customer-Provided Keys (SSE-C)
Why it's wrong here
SSE-C has the customer provide keys, not the cloud provider.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between 'provider-managed keys' (SSE-S3) and 'customer-managed keys' (SSE-KMS or SSE-C), where candidates mistakenly choose SSE-KMS because it offers more control, but the question explicitly requires keys managed solely by the provider.
Detailed technical explanation
How to think about this question
SSE-S3 uses AES-256 in Galois/Counter Mode (GCM) for each object, with a unique key generated per object and then encrypted by a master key that rotates automatically. This model is ideal for compliance scenarios where the customer must demonstrate that the cloud provider has no access to plaintext keys, as the provider manages the entire key lifecycle without customer involvement. In practice, SSE-S3 is the default encryption for S3 buckets when 'Bucket Default Encryption' is enabled, and it incurs no additional KMS API costs.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
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.
Cloud Data Security — This question tests Cloud Data Security — 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 S3-Managed Keys (SSE-S3) — The requirement specifies that the cloud provider manages the encryption keys. SSE-S3 uses keys that are entirely managed by AWS (S3) for encrypting data at rest, with each object encrypted by a unique key that is itself encrypted by a regularly rotated master key. This aligns perfectly with the scenario where the customer does not want to manage keys.
What should I do if I get this CCSP 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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This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
Question Discussion
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