← CLF-C02·Amazon Web Services

Question 62 of 1,024

Security and Compliance →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is Server-Side Encryption with Customer-Provided Keys (SSE-C). This is the correct choice because SSE-C allows you to provide your own encryption keys when uploading objects to Amazon S3, and AWS performs the encryption and decryption using those keys but immediately discards them after the operation, never storing or managing them on its servers. This directly satisfies the compliance requirement that encryption keys must be managed entirely by the customer and never by the cloud provider. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your ability to distinguish between S3 encryption options, with SSE-S3 (where AWS manages keys) and SSE-KMS (where AWS stores keys) being common traps for scenarios requiring full customer key control. A useful memory tip is to think of the "C" in SSE-C as standing for "Customer-Controlled" — if the policy says the cloud provider cannot touch the keys, SSE-C is your only path.

CLF-C02 Security and Compliance Practice Question

This CLF-C02 practice question tests your understanding of security and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 financial services company requires all data stored in Amazon S3 to be encrypted at rest. The company has a compliance policy that states encryption keys must be managed entirely by the customer and must never be stored or managed by the cloud provider. Which encryption option should the company use for Amazon S3?

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.

Question 1mediummultiple choice

Full question →

A
Server-Side Encryption with Amazon S3-Managed Keys (SSE-S3)
Why wrong: Incorrect. SSE-S3 uses encryption keys that are managed entirely by AWS. This violates the compliance policy that keys must never be stored or managed by the cloud provider.
B
Server-Side Encryption with AWS KMS Customer Managed Keys (SSE-KMS)
Why wrong: Incorrect. While SSE-KMS allows you to use a customer managed key, the key is still stored and managed by AWS KMS (a cloud service). The key material resides in AWS, which does not satisfy the requirement that keys must never be stored by the cloud provider.
C
Server-Side Encryption with Customer-Provided Keys (SSE-C)
Correct. SSE-C allows you to provide your own encryption key with each request. AWS uses the key to encrypt/decrypt the data but does not store the key. This meets the compliance requirement that keys are managed entirely by the customer and are never stored by the cloud provider.
D
Client-Side Encryption using an on-premises key management system
Why wrong: Incorrect. Client-side encryption encrypts data before it is sent to S3, which satisfies the key management requirement, but the question asks for an encryption option for Amazon S3. Client-side encryption is not an S3 server-side feature and would require additional application changes. Among the server-side options, only SSE-C ensures keys are not stored by AWS.

Full breakdown with real-world context →

Answer choices

Why each option matters

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)

SSE-C allows the customer to provide their own encryption keys for server-side encryption of S3 objects. The customer manages the keys entirely, and AWS does not store or manage them, meeting the compliance requirement that encryption keys must never be stored or managed by the cloud provider.

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 Amazon S3-Managed Keys (SSE-S3)
Why it's wrong here
Incorrect. SSE-S3 uses encryption keys that are managed entirely by AWS. This violates the compliance policy that keys must never be stored or managed by the cloud provider.
✗
Server-Side Encryption with AWS KMS Customer Managed Keys (SSE-KMS)
Why it's wrong here
Incorrect. While SSE-KMS allows you to use a customer managed key, the key is still stored and managed by AWS KMS (a cloud service). The key material resides in AWS, which does not satisfy the requirement that keys must never be stored by the cloud provider.
✓
Server-Side Encryption with Customer-Provided Keys (SSE-C)
Why this is correct
Correct. SSE-C allows you to provide your own encryption key with each request. AWS uses the key to encrypt/decrypt the data but does not store the key. This meets the compliance requirement that keys are managed entirely by the customer and are never stored by 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.
✗
Client-Side Encryption using an on-premises key management system
Why it's wrong here
Incorrect. Client-side encryption encrypts data before it is sent to S3, which satisfies the key management requirement, but the question asks for an encryption option for Amazon S3. Client-side encryption is not an S3 server-side feature and would require additional application changes. Among the server-side options, only SSE-C ensures keys are not stored by AWS.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often choose SSE-KMS (Option B) thinking 'customer managed keys' means the customer fully controls the keys, but AWS KMS still stores and manages the key material, which violates the policy that keys must never be stored or managed by the cloud provider.

Detailed technical explanation

How to think about this question

With SSE-C, you must include the encryption key in your request to S3, which uses it to encrypt the object at rest and then discards the key; you are responsible for key storage and rotation. This differs from SSE-KMS, where AWS KMS stores the key material and manages key lifecycle, even for customer managed keys. A real-world scenario is a financial institution that must maintain full control over key material due to regulatory mandates like PCI DSS or GDPR, where the cloud provider cannot have any access to the encryption keys.

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 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

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.

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FAQ

Questions learners often ask

What does this CLF-C02 question test?

Security and Compliance — This question tests Security and Compliance — 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) — SSE-C allows the customer to provide their own encryption keys for server-side encryption of S3 objects. The customer manages the keys entirely, and AWS does not store or manage them, meeting the compliance requirement that encryption keys must never be stored or managed by the cloud provider.

What should I do if I get this CLF-C02 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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This CLF-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 CLF-C02 exam.