The answer is a combination of Cloud HSM for key management and a cloud storage service with object-level ACLs. This is correct because Cloud HSM ensures customer-managed encryption keys for data at rest, giving the organization sole custody and control over the cryptographic material, which directly addresses the requirement that the cloud provider cannot access the keys. Pairing this with object-level ACLs enables granular access control, allowing permissions to be set per data classification level rather than broad bucket policies. On the Certified Cloud Security Professional CCSP exam, this scenario tests your understanding of the shared responsibility model and the distinction between provider-managed and customer-managed keys—a common trap is assuming server-side encryption with provider keys is sufficient. Remember the memory tip: “HSM for keys, ACLs for access” to quickly recall that key sovereignty and fine-grained permissions must come from separate, complementary services.
CCSP Cloud Security Operations Practice Question
This CCSP practice question tests your understanding of cloud security operations. 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 is designing a cloud storage solution for highly sensitive customer data. The data must be encrypted at rest and the encryption keys must be managed by the customer, not the cloud provider. Additionally, the solution must allow granular access control based on data classification. Which combination of services should the architect recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud HSM for key management and a cloud storage service with object-level ACLs.
Option C is correct because Cloud HSM provides customer-managed keys for encryption at rest, ensuring the customer retains sole control over the keys. Combined with a cloud storage service that supports object-level ACLs, this allows granular access control based on data classification, meeting both requirements.
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 customer-managed keys and a storage bucket with bucket-level policies.
Why it's wrong here
Bucket-level policies lack granular access control based on data classification.
✗
Server-side encryption with cloud-managed keys and a storage bucket with bucket-level policies.
Why it's wrong here
Keys are not customer-managed, and bucket policies are not granular.
✓
Cloud HSM for key management and a cloud storage service with object-level ACLs.
Why this is correct
Customer-managed keys in HSM and object-level ACLs meet both requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Client-side encryption with a cloud KMS and a storage bucket with bucket-level policies.
Why it's wrong here
Cloud KMS still involves cloud management of keys, and bucket policies are not granular.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between server-side encryption (where the provider performs encryption) and client-side encryption (where the customer encrypts before upload), and the trap here is assuming that server-side encryption with customer-managed keys (Option A) gives the customer full control over key management, when in fact the provider still has access to the keys during encryption/decryption operations.
Detailed technical explanation
How to think about this question
Cloud HSM (Hardware Security Module) is a FIPS 140-2 Level 3 validated device that generates and stores keys in tamper-resistant hardware, ensuring the customer has exclusive control over key material. Object-level ACLs in cloud storage (e.g., AWS S3 object ACLs or Azure Blob Storage ACLs) allow per-object permissions, enabling fine-grained access based on tags or metadata representing data classification levels (e.g., 'Confidential', 'Restricted'). In contrast, bucket-level policies apply uniformly to all objects in the bucket, lacking the granularity needed for multi-classification environments.
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 Security Operations — This question tests Cloud Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud HSM for key management and a cloud storage service with object-level ACLs. — Option C is correct because Cloud HSM provides customer-managed keys for encryption at rest, ensuring the customer retains sole control over the keys. Combined with a cloud storage service that supports object-level ACLs, this allows granular access control based on data classification, meeting both requirements.
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.
About these practice questions
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Variation 1. Which TWO of the following are valid methods for securing data at rest in a cloud storage service?
easy
A.Disabling encryption to reduce latency.
✓ B.Implementing client-side encryption before uploading data.
✓ C.Using server-side encryption with customer-managed keys.
D.Setting the storage bucket to public read access.
E.Enabling access logging for the storage bucket.
Why B: Option B is correct because client-side encryption ensures data is encrypted before it leaves the client environment, so the cloud provider never has access to the plaintext. This is a valid method for securing data at rest in cloud storage, as the encrypted objects are stored in the service and can only be decrypted by the client holding the keys.
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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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