The answer is Infrastructure as a Service (IaaS) because it is the only cloud service model that grants the customer sole control over encryption keys. In IaaS, you manage the virtual machines, storage, and networking layers directly, allowing you to deploy your own encryption mechanisms—such as a Hardware Security Module (HSM) or a dedicated key management service (KMS)—that the cloud provider cannot access. On the CCSP exam, this question tests your understanding of the shared responsibility model and how each service model shifts control of the underlying infrastructure. A common trap is choosing Platform as a Service (PaaS) or Software as a Service (SaaS), where the provider retains some level of key management access. Remember the memory tip: “IaaS gives you the keys to the castle; PaaS and SaaS keep the locksmith on staff.”
CCSP Cloud Concepts, Architecture and Design Practice Question
This CCSP practice question tests your understanding of cloud concepts, architecture and design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 healthcare organization is migrating sensitive patient data to a public cloud. The compliance team requires that data be encrypted at rest and in transit, and that the cloud provider cannot access the encryption keys. Which cloud service model should the organization use to maintain sole control over encryption keys?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Infrastructure as a Service (IaaS)
IaaS provides the customer with full control over the underlying infrastructure, including virtual machines, storage, and networking. This allows the organization to implement their own encryption mechanisms and manage their own keys using a Hardware Security Module (HSM) or a key management service (KMS) that the cloud provider cannot access. In contrast, SaaS and PaaS typically abstract away the infrastructure, limiting customer control over encryption key management.
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.
✗
Software as a Service (SaaS)
Why it's wrong here
SaaS providers typically manage encryption and may have access to keys.
✓
Infrastructure as a Service (IaaS)
Why this is correct
IaaS gives the customer control over the OS, storage, and encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Hybrid Cloud
Why it's wrong here
Hybrid is a deployment model, not a service model, and does not directly address key control.
✗
Platform as a Service (PaaS)
Why it's wrong here
PaaS abstracts the underlying infrastructure, often limiting customer control over encryption keys.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between service models (IaaS, PaaS, SaaS) and deployment models (public, private, hybrid), so the trap here is that candidates mistakenly choose Hybrid Cloud (Option C) because they think it allows key control, but it is a deployment model that does not guarantee sole key management in the public cloud component.
Detailed technical explanation
How to think about this question
Under the hood, IaaS allows customers to deploy their own virtual machines with full disk encryption using LUKS or BitLocker, and to manage keys via a customer-controlled HSM (e.g., AWS CloudHSM or Azure Dedicated HSM) that ensures the cloud provider never has access to the key material. In contrast, PaaS services like Azure SQL Database or AWS RDS use transparent data encryption (TDE) where the provider manages the key hierarchy, and even with customer-managed keys (CMK), the provider still has access to the key encryption key (KEK) through its KMS. A real-world scenario is a healthcare organization using IaaS to run a self-managed database with client-side encryption, ensuring compliance with HIPAA and the HITECH Act.
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 Concepts, Architecture and Design — This question tests Cloud Concepts, Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Infrastructure as a Service (IaaS) — IaaS provides the customer with full control over the underlying infrastructure, including virtual machines, storage, and networking. This allows the organization to implement their own encryption mechanisms and manage their own keys using a Hardware Security Module (HSM) or a key management service (KMS) that the cloud provider cannot access. In contrast, SaaS and PaaS typically abstract away the infrastructure, limiting customer control over encryption key management.
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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