Quick Answer
The correct answer is SSE-KMS, but the two valid methods to protect data at rest in Amazon S3 are SSE-S3 and SSE-KMS. SSE-S3 uses AES-256 encryption with keys managed entirely by Amazon S3, which automatically rotates the keys and handles encryption before writing objects to disk, making it a fully hands-off approach for data at rest. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of the three server-side encryption methods—SSE-S3, SSE-KMS, and SSE-C—and a common trap is assuming that only SSE-KMS is valid because it offers more control, when in fact SSE-S3 is also a fully compliant method for protecting data at rest. Remember that SSE-S3 is the simplest, SSE-KMS adds envelope encryption and audit trails, and SSE-C requires you to manage your own keys. For the exam, a quick memory tip is “S3 for simplicity, KMS for control, C for custom.”
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 is designing a data protection strategy for Amazon S3. Which TWO of the following are valid methods to protect data at rest in S3?
S3 Versioning
Why wrong: Protects against overwrites, not encryption.
S3 bucket policies
Why wrong: Access control, not encryption.
MFA Delete
Why wrong: Adds authentication, not encryption.
Server-side encryption with S3-managed keys (SSE-S3)
Encrypts data at rest.
Server-side encryption with AWS KMS (SSE-KMS)
Encrypts data at rest.
Answer choices
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 S3-managed keys (SSE-S3)
Server-side encryption with S3-managed keys (SSE-S3) encrypts data at rest using AES-256, with Amazon S3 managing the encryption/decryption process and key rotation automatically. This is a valid method to protect data at rest in S3 because it ensures objects are encrypted before being written to disk and decrypted when accessed, without requiring any additional client-side logic or key management overhead.
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.
S3 Versioning
Why it's wrong here
Protects against overwrites, not encryption.
S3 bucket policies
Why it's wrong here
Access control, not encryption.
MFA Delete
Why it's wrong here
Adds authentication, not encryption.
Server-side encryption with S3-managed keys (SSE-S3)
Why this is correct
Encrypts data at rest.
Related concept
Read the scenario before looking for a memorised answer.
Server-side encryption with AWS KMS (SSE-KMS)
Why this is correct
Encrypts data at rest.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse data protection features like versioning or access controls (bucket policies, MFA Delete) with encryption mechanisms, assuming they provide data-at-rest protection when they do not.
Detailed technical explanation
SSE-S3 uses a unique envelope encryption model where each object is encrypted with a unique data key, which is then encrypted with a regularly rotated master key managed by AWS. This approach ensures that even if an attacker gains access to the underlying storage hardware, the encrypted data remains unreadable without the keys. In contrast, SSE-KMS provides additional control over key rotation, audit trails via AWS CloudTrail, and the ability to enforce key usage policies, making it suitable for compliance requirements like PCI-DSS or HIPAA.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Protection — study guide chapter
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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: Server-side encryption with S3-managed keys (SSE-S3) — Server-side encryption with S3-managed keys (SSE-S3) encrypts data at rest using AES-256, with Amazon S3 managing the encryption/decryption process and key rotation automatically. This is a valid method to protect data at rest in S3 because it ensures objects are encrypted before being written to disk and decrypted when accessed, without requiring any additional client-side logic or key management overhead.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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