CISSP Security Architecture and Engineering Practice Question
This CISSP practice question tests your understanding of security architecture and engineering. 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 deploying a new application that processes personally identifiable information (PII) in a hybrid cloud environment. The security architect needs to ensure that encryption keys are never exposed to the cloud provider. Which solution should be recommended?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Client-side encryption with keys stored on-premises
Client-side encryption ensures that encryption keys are generated and managed on-premises, never transmitted to the cloud provider. This directly meets the requirement that keys are never exposed to the cloud provider, as all cryptographic operations occur before data leaves the customer's controlled environment.
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.
✗
Envelope encryption with a key management service
Why it's wrong here
Incorrect. The KMS may store keys in the cloud.
✗
Server-side encryption with cloud provider managed keys
Why it's wrong here
Incorrect. Keys are managed by the provider.
✓
Client-side encryption with keys stored on-premises
Why this is correct
Correct. Keys are never sent to the cloud provider.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Server-side encryption with customer-provided keys
Why it's wrong here
Incorrect. The key is provided to the cloud during encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing 'customer-provided keys' (SSE-C) with 'client-side encryption' — SSE-C still sends the key to the cloud provider for each operation, while client-side encryption keeps the key entirely on-premises.
Detailed technical explanation
How to think about this question
Client-side encryption typically uses libraries like AWS SDK's AmazonS3EncryptionClient or Azure Storage Client Library, where data is encrypted with a customer-managed key before upload. The cloud provider never sees the plaintext key; only encrypted ciphertext and potentially a key identifier are stored. This approach aligns with the principle of 'zero-knowledge' encryption, often required for compliance with regulations like HIPAA or GDPR when using public cloud services.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Security Architecture and Engineering — This question tests Security Architecture and Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Client-side encryption with keys stored on-premises — Client-side encryption ensures that encryption keys are generated and managed on-premises, never transmitted to the cloud provider. This directly meets the requirement that keys are never exposed to the cloud provider, as all cryptographic operations occur before data leaves the customer's controlled environment.
What should I do if I get this CISSP 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: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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