Quick Answer
The correct answer is SSE-S3, or server-side encryption with S3 managed keys. This option uses AES-256 encryption keys that are generated, rotated, and stored entirely by AWS, meaning the customer has no key management overhead. When an object is uploaded, S3 encrypts it before writing to disk and automatically decrypts it upon retrieval, fulfilling the requirement for encryption at rest with AWS-managed keys. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your ability to distinguish between SSE-S3, SSE-KMS, and SSE-C; a common trap is assuming that SSE-KMS is the only “AWS-managed” option, but SSE-S3 is the purest form of AWS-managed key control because the customer never touches or configures the keys. Remember the memory tip: “S3 for simplicity, KMS for control” — if the scenario says “keys managed entirely by AWS with no customer action,” always pick SSE-S3.
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 ensure that data stored in Amazon S3 is encrypted at rest using keys managed by AWS. Which encryption option should they choose?
Client-side encryption.
Why wrong: Customer manages keys on client side.
Server-side encryption with AWS KMS (SSE-KMS).
Why wrong: Keys are managed by the customer in KMS.
Server-side encryption with customer-provided keys (SSE-C).
Why wrong: Customer provides and manages keys.
Server-side encryption with S3 managed keys (SSE-S3).
Keys are managed by AWS.
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).
SSE-S3 uses AES-256 encryption keys managed entirely by AWS, fulfilling the requirement for encryption at rest with AWS-managed keys. When you upload an object, S3 encrypts it before writing to disk and decrypts it when you access it, all without any customer action 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.
Client-side encryption.
Why it's wrong here
Customer manages keys on client side.
Server-side encryption with AWS KMS (SSE-KMS).
Why it's wrong here
Keys are managed by the customer in KMS.
Server-side encryption with customer-provided keys (SSE-C).
Why it's wrong here
Customer provides and manages keys.
Server-side encryption with S3 managed keys (SSE-S3).
Why this is correct
Keys are managed by AWS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse SSE-KMS as 'AWS-managed' because KMS can use AWS managed keys, but the question specifically requires keys managed solely by AWS without any customer involvement, which only SSE-S3 provides.
Detailed technical explanation
SSE-S3 implements envelope encryption where a unique per-object key encrypts the object, and that key is itself encrypted with a master key that rotates regularly. This design ensures that even if an attacker gains access to the underlying storage, they cannot decrypt objects without the master key, which never leaves AWS's secure key management infrastructure. In real-world scenarios, SSE-S3 is ideal for compliance requirements that mandate encryption at rest without the operational burden of key rotation or access auditing.
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: Server-side encryption with S3 managed keys (SSE-S3). — SSE-S3 uses AES-256 encryption keys managed entirely by AWS, fulfilling the requirement for encryption at rest with AWS-managed keys. When you upload an object, S3 encrypts it before writing to disk and decrypts it when you access it, all without any customer action 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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