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 company is migrating its customer database to a cloud object storage service. The database contains personally identifiable information (PII). The security team requires that all data be encrypted at rest and that the company retains exclusive control over the encryption keys. 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 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 customer-managed keys stored on-premises.
Option C is correct because client-side encryption with customer-managed keys stored on-premises ensures that the encryption keys never leave the company's control, and the data is encrypted before it is uploaded to the cloud object storage service. This satisfies both the requirement for encryption at rest and exclusive key control, as the cloud provider never has access to the plaintext keys or the ability to decrypt the data.
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 cloud provider-managed keys (SSE-S3).
Why it's wrong here
Keys are managed by the CSP, not exclusive to the company.
Use client-side encryption with customer-managed keys stored on-premises.
Why this is correct
Keys never leave the company; exclusive control maintained.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use server-side encryption with customer-provided keys (SSE-C).
Why it's wrong here
Key must be transmitted with each request, still exposed to network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SSE-C with client-side encryption, assuming that providing your own key to the server (SSE-C) gives you exclusive control, but in SSE-C the cloud provider still handles the encryption/decryption process and may retain the key in memory, whereas client-side encryption ensures the provider never sees the key at all.
Detailed technical explanation
How to think about this question
Client-side encryption typically uses a library like AWS SDK's AmazonS3EncryptionClient or a similar tool, where the data is encrypted using a customer-managed key (e.g., an AES-256 key) before the HTTP PUT request is sent to the object storage service. The cloud provider stores only the ciphertext and has no access to the encryption key, which remains on-premises in a hardware security module (HSM) or a secure key store. This approach also allows the customer to implement envelope encryption, where a data key is encrypted by a master key, providing additional security and key rotation flexibility.
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 customer-managed keys stored on-premises. — Option C is correct because client-side encryption with customer-managed keys stored on-premises ensures that the encryption keys never leave the company's control, and the data is encrypted before it is uploaded to the cloud object storage service. This satisfies both the requirement for encryption at rest and exclusive key control, as the cloud provider never has access to the plaintext keys or the ability to decrypt the data.
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: "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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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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