This CCSP practice question tests your understanding of cloud data 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.
A cloud consumer uses an IaaS provider for storage of archived financial records. Regulatory requirements mandate that data at rest be encrypted using a key that is under the consumer's sole control. Which encryption approach should the consumer implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use client-side encryption with keys stored in the consumer's on-premises HSM
Option A is correct because client-side encryption ensures the data is encrypted before it leaves the consumer's environment, and storing the keys in the consumer's on-premises HSM guarantees sole control over the encryption keys, meeting the regulatory requirement for data-at-rest encryption with keys under the consumer's sole control.
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 client-side encryption with keys stored in the consumer's on-premises HSM
Why this is correct
Client-side encryption gives the consumer sole control over encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
Enable server-side encryption with keys managed by the cloud provider
Why it's wrong here
Provider-managed keys do not meet the consumer control requirement.
✗
Use server-side encryption with customer-provided keys (SSE-C)
Why it's wrong here
SSE-C keys are still stored on the server, so the provider has access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between 'customer-provided keys' (SSE-C) and 'client-side encryption' — candidates confuse SSE-C as giving sole control, but the key is still used by the provider's infrastructure, not solely under the consumer's control.
Detailed technical explanation
How to think about this question
Client-side encryption typically uses a library like AWS SDK's AmazonS3EncryptionClient or Azure Storage Client Library, where the data is encrypted with a symmetric key (e.g., AES-256) before upload, and the key is stored in a local HSM or key management system. The cloud provider never sees the plaintext key, ensuring true separation of duties. In contrast, SSE-C still requires the provider to handle the key during encryption/decryption, and the key is often cached or logged, which may not satisfy strict regulatory audits.
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: Use client-side encryption with keys stored in the consumer's on-premises HSM — Option A is correct because client-side encryption ensures the data is encrypted before it leaves the consumer's environment, and storing the keys in the consumer's on-premises HSM guarantees sole control over the encryption keys, meeting the regulatory requirement for data-at-rest encryption with keys under the consumer's sole control.
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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