- A
Use S3 server-side encryption with customer-provided keys (SSE-C).
SSE-C is a valid method: you provide your own encryption keys and S3 handles encryption/decryption of data at rest.
- B
Enable S3 Object Lock.
Why wrong: S3 Object Lock prevents object deletion or version overwrites, not encryption.
- C
Use client-side encryption before uploading objects to S3.
Client-side encryption is valid: data is encrypted before leaving the client, so it is encrypted at rest in S3.
- D
Enable S3 Transfer Acceleration.
Why wrong: S3 Transfer Acceleration speeds up uploads over long distances, not encryption.
- E
Use S3 server-side encryption with S3-managed keys (SSE-S3).
Why wrong: While SSE-S3 is a valid encryption method, it is not one of the two correct answers for this question; the correct pair is SSE-C and client-side encryption.
S3 Server-Side Encryption Methods: SSE-C and SSE-S3
This SCS-C02 practice question tests your understanding of infrastructure 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.
Which TWO of the following are valid methods to secure data at rest in Amazon S3? (Choose two.)
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
Use S3 server-side encryption with customer-provided keys (SSE-C).
Both SSE-C and client-side encryption are valid methods for securing data at rest in Amazon S3. SSE-C uses server-side encryption with customer-provided keys, while client-side encryption encrypts data before uploading. Although SSE-S3 is also valid, the question focuses on two specific methods: customer-controlled encryption and client-side encryption.
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.
- ✓
Use S3 server-side encryption with customer-provided keys (SSE-C).
Why this is correct
SSE-C is a valid method: you provide your own encryption keys and S3 handles encryption/decryption of data at rest.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable S3 Object Lock.
Why it's wrong here
S3 Object Lock prevents object deletion or version overwrites, not encryption.
- ✓
Use client-side encryption before uploading objects to S3.
Why this is correct
Client-side encryption is valid: data is encrypted before leaving the client, so it is encrypted at rest in S3.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable S3 Transfer Acceleration.
Why it's wrong here
S3 Transfer Acceleration speeds up uploads over long distances, not encryption.
- ✗
Use S3 server-side encryption with S3-managed keys (SSE-S3).
Why it's wrong here
While SSE-S3 is a valid encryption method, it is not one of the two correct answers for this question; the correct pair is SSE-C and client-side encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often overlook client-side encryption as a valid method for data at rest because encryption occurs before upload. However, it is a recognized method in the AWS Security Specialty exam.
Detailed technical explanation
How to think about this question
SSE-C uses AES-256 encryption, and you must include the encryption key in the request headers for each upload or download; S3 computes the HMAC of the key to verify integrity but never stores the key. This is useful for regulatory compliance where you must retain full control of encryption keys, such as in financial services or healthcare, but requires careful key management to avoid data loss. SSE-S3, on the other hand, uses S3-managed keys with AES-256 and is fully managed by AWS, making it simpler but less customizable.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 SCS-C02 question test?
Infrastructure Security — This question tests Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use S3 server-side encryption with customer-provided keys (SSE-C). — Both SSE-C and client-side encryption are valid methods for securing data at rest in Amazon S3. SSE-C uses server-side encryption with customer-provided keys, while client-side encryption encrypts data before uploading. Although SSE-S3 is also valid, the question focuses on two specific methods: customer-controlled encryption and client-side encryption.
What should I do if I get this SCS-C02 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on SCS-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security engineer needs to ensure that all data stored in an Amazon S3 bucket is encrypted at rest. The bucket must use server-side encryption with a key managed by the customer (SSE-C). What must the engineer include in the PUT request to enforce this?
easy- ✓ A.x-amz-server-side-encryption-customer-algorithm and x-amz-server-side-encryption-customer-key
- B.x-amz-server-side-encryption: AES256
- C.x-amz-server-side-encryption: aws:kms
- D.x-amz-server-side-encryption-bucket-key-enabled: true
Why A: Option A is correct because SSE-C requires the client to provide both the encryption algorithm and the encryption key in the PUT request headers. The `x-amz-server-side-encryption-customer-algorithm` header must be set to `AES256`, and the `x-amz-server-side-encryption-customer-key` header must contain the base64-encoded 256-bit key. Without these headers, S3 will not apply customer-provided encryption keys, and the object will not be encrypted with SSE-C.
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Last reviewed: Jul 4, 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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