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 uses a hybrid cloud architecture with on-premises key management and cloud services. They need to ensure that encryption keys used for cloud data are never exposed to the cloud provider. Which key management approach best meets this requirement?
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.
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.
Use the cloud provider's native key management service
Why wrong: Provider manages keys, so they have access.
Store keys in a cloud key vault with access logs
Why wrong: Provider still controls the vault infrastructure.
Use a BYOK solution with an on-premises HSM and key caching
BYOK allows key generation and lifetime outside the cloud.
Deploy a cloud-based HSM and store keys only there
Why wrong: HSM is still in provider's environment.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use a BYOK solution with an on-premises HSM and key caching
Option C is correct because a Bring Your Own Key (BYOK) solution with an on-premises Hardware Security Module (HSM) allows the company to generate and store encryption keys locally, then securely transfer them to the cloud for use without exposing the raw key material to the cloud provider. Key caching ensures that the cloud service can perform operations without the provider ever having persistent access to the plaintext keys, meeting the requirement that keys are 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
For each option: why learners choose it and why it is or isn't the right answer here.
Use the cloud provider's native key management service
Why it's wrong here
Provider manages keys, so they have access.
Store keys in a cloud key vault with access logs
Why it's wrong here
Provider still controls the vault infrastructure.
Use a BYOK solution with an on-premises HSM and key caching
Why this is correct
BYOK allows key generation and lifetime outside the cloud.
Clue confirmation
The clue words "best", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Deploy a cloud-based HSM and store keys only there
Why it's wrong here
HSM is still in provider's environment.
Common exam traps
ISC2 often tests the misconception that a cloud-based HSM (Option D) is equivalent to on-premises key control, but the trap is that any key stored in the cloud provider's infrastructure is still accessible to the provider, whereas BYOK with an on-premises HSM ensures the provider never has access to the plaintext key material.
Detailed technical explanation
BYOK typically uses a key wrapping mechanism (e.g., RSA-OAEP or AES key wrap per RFC 3394) to encrypt the customer-generated key with a cloud-provider-specific public key before transmission, ensuring the provider never sees the plaintext key. The on-premises HSM provides FIPS 140-2 Level 3 or higher security for key generation and storage, while key caching in the cloud (e.g., via a cloud HSM proxy) allows temporary use of the key for decryption without persisting it. In a real-world scenario, this is critical for compliance with regulations like PCI DSS or GDPR that require the data owner to maintain sole control over encryption keys.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
The correct answer is: Use a BYOK solution with an on-premises HSM and key caching — Option C is correct because a Bring Your Own Key (BYOK) solution with an on-premises Hardware Security Module (HSM) allows the company to generate and store encryption keys locally, then securely transfer them to the cloud for use without exposing the raw key material to the cloud provider. Key caching ensures that the cloud service can perform operations without the provider ever having persistent access to the plaintext keys, meeting the requirement that keys are never exposed to the cloud provider.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best", "never". 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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