CCSP Cloud Platform and Infrastructure Security Practice Question
This CCSP practice question tests your understanding of cloud platform and infrastructure security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An organization requires that all data at rest in a cloud storage service be encrypted using a key that is managed entirely on-premises and never exposed to the cloud provider. The organization wants to use server-side encryption. Which approach should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use server-side encryption with a customer-provided key (SSE-C).
Server-side encryption with customer-provided keys (SSE-C) allows the organization to encrypt data at rest in the cloud while retaining full control of the encryption keys on-premises. With SSE-C, the customer provides the encryption key with each API request, and the cloud service uses it to encrypt/decrypt the data server-side, but the key is never stored by the provider. This meets the requirement of keeping the key entirely on-premises and never exposed to the cloud provider.
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 server-side encryption with a key stored in the cloud provider's key management service (KMS).
Why it's wrong here
KMS keys are stored in the cloud, violating the requirement.
✓
Use server-side encryption with a customer-provided key (SSE-C).
Why this is correct
SSE-C encrypts data at rest using a key that you provide; the cloud does not store the key.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use server-side encryption with a cloud-managed key (SSE-S3).
Why it's wrong here
Cloud-managed keys are fully managed by the provider, not by the customer.
✗
Use client-side encryption where the application encrypts data before sending it to the cloud.
Why it's wrong here
Client-side encryption is not server-side; it encrypts data before upload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between server-side and client-side encryption, and candidates may mistakenly choose client-side encryption (Option D) because it keeps keys on-premises, but the question specifically requires server-side encryption, making SSE-C the only correct option.
Detailed technical explanation
How to think about this question
SSE-C works by having the client include the encryption key in the HTTP headers (e.g., x-amz-server-side-encryption-customer-key for AWS S3) for each upload or download request. The cloud service uses the key to perform AES-256 encryption on the server side, then discards the key after the operation, ensuring no persistent key storage. A subtle behavior is that the key must be provided for every read request as well, which can introduce latency and requires secure key distribution mechanisms.
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 Platform and Infrastructure Security — This question tests Cloud Platform and Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use server-side encryption with a customer-provided key (SSE-C). — Server-side encryption with customer-provided keys (SSE-C) allows the organization to encrypt data at rest in the cloud while retaining full control of the encryption keys on-premises. With SSE-C, the customer provides the encryption key with each API request, and the cloud service uses it to encrypt/decrypt the data server-side, but the key is never stored by the provider. This meets the requirement of keeping the key entirely on-premises and never exposed to the cloud provider.
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.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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