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 designing a data at rest encryption strategy for their cloud environment. Which TWO of the following are valid approaches? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Server-side encryption with customer-provided keys (SSE-C)
Server-side encryption with customer-provided keys (SSE-C) is a valid data-at-rest encryption approach because the customer retains control over the encryption keys while the cloud provider performs the encryption/decryption operations. This allows the customer to manage key lifecycle and compliance requirements without exposing plaintext keys to the provider. Client-side encryption is also valid because data is encrypted before being sent to the cloud, ensuring the provider never has access to plaintext data or encryption keys.
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-provided keys (SSE-C)
Why this is correct
Customer provides the encryption key, which the cloud uses temporarily.
Related concept
Read the scenario before looking for a memorised answer.
✗
Hashing data before storage
Why it's wrong here
Hashing is not encryption; it is not reversible.
✓
Client-side encryption
Why this is correct
Encryption performed on client side; cloud never sees plaintext.
Related concept
Read the scenario before looking for a memorised answer.
✗
Tokenization of sensitive fields
Why it's wrong here
Tokenization is not encryption, though it protects data.
✗
Server-side encryption with cloud-managed keys (SSE-S3)
Why it's wrong here
Cloud provider manages keys and has access to data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between encryption and other data protection methods like hashing or tokenization, and the trap here is that candidates may confuse hashing or tokenization with encryption, or incorrectly assume that server-side encryption with cloud-managed keys is not a valid approach when it actually is, but the question requires selecting exactly two correct answers from the list.
Detailed technical explanation
How to think about this question
SSE-C uses a customer-supplied key (e.g., AES-256) that is sent with each API request to encrypt/decrypt objects; the cloud provider discards the key after the operation, storing only the encrypted data. Client-side encryption often uses libraries like AWS SDK's AmazonS3EncryptionClient or Google Cloud's Tink, which encrypt data with a data key (e.g., AES-GCM) before upload, and the key itself may be wrapped with a master key. A real-world scenario is a healthcare company that must ensure no cloud provider has access to patient data; they would use client-side encryption or SSE-C to maintain exclusive key control.
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: Server-side encryption with customer-provided keys (SSE-C) — Server-side encryption with customer-provided keys (SSE-C) is a valid data-at-rest encryption approach because the customer retains control over the encryption keys while the cloud provider performs the encryption/decryption operations. This allows the customer to manage key lifecycle and compliance requirements without exposing plaintext keys to the provider. Client-side encryption is also valid because data is encrypted before being sent to the cloud, ensuring the provider never has access to plaintext data or encryption keys.
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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Question Discussion
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