This SCS-C02 practice question tests your understanding of data protection. 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 wants to use client-side encryption for data uploaded to Amazon S3. The encryption keys must be managed by the company and never sent to AWS. Which S3 encryption option supports this requirement?
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.
Server-side encryption with AWS KMS (SSE-KMS).
Why wrong: The key is stored in AWS KMS.
Client-side encryption using the Amazon S3 encryption client.
Encryption happens on client side; keys never sent to AWS.
Server-side encryption with S3 managed keys (SSE-S3).
Why wrong: AWS manages the keys.
Server-side encryption with customer-provided keys (SSE-C).
Why wrong: The key is sent to S3 for each request.
Answer choices
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 using the Amazon S3 encryption client.
Client-side encryption using the Amazon S3 encryption client is correct because the encryption process occurs entirely on the client side before data is uploaded to S3. The company manages the encryption keys locally and never transmits them to AWS, satisfying the requirement that keys are never sent to AWS.
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.
Server-side encryption with AWS KMS (SSE-KMS).
Why it's wrong here
The key is stored in AWS KMS.
Client-side encryption using the Amazon S3 encryption client.
Why this is correct
Encryption happens on client side; keys never sent to AWS.
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 S3 managed keys (SSE-S3).
Why it's wrong here
AWS manages the keys.
Server-side encryption with customer-provided keys (SSE-C).
Why it's wrong here
The key is sent to S3 for each request.
Common exam traps
The trap here is that candidates often confuse SSE-C with client-side encryption, not realizing that SSE-C still transmits the encryption key to AWS over the network, albeit encrypted in transit, which violates the 'never sent to AWS' requirement.
Detailed technical explanation
Client-side encryption with the Amazon S3 encryption client typically uses envelope encryption: a data key encrypts the object, and a master key (managed by the customer) encrypts the data key. The encrypted data key is stored alongside the object in S3, allowing decryption only by the customer who holds the master key. This approach ensures that AWS never has access to the plaintext keys or data, meeting strict compliance requirements like those in healthcare or finance.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
The correct answer is: Client-side encryption using the Amazon S3 encryption client. — Client-side encryption using the Amazon S3 encryption client is correct because the encryption process occurs entirely on the client side before data is uploaded to S3. The company manages the encryption keys locally and never transmits them to AWS, satisfying the requirement that keys are never sent to AWS.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This SCS-C02 practice question is part of Courseiva's free Amazon Web Services 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 SCS-C02 exam.
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