The correct answer is that the customer provides the encryption key in each request to S3. This is because SSE-C (server-side encryption with customer-provided keys) requires you to supply both the encryption key and its MD5 digest with every PUT, GET, or HEAD request; Amazon S3 uses that key to encrypt or decrypt the object at rest, then immediately discards the key without ever storing it. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of data sovereignty and key management—a common trap is assuming AWS retains the key or that you only need to provide it once during upload. Remember the key distinction: with SSE-C, you own the key material entirely, and S3 acts as a stateless encryption engine. A useful memory tip is “C for Customer, C for Carry the Key”—you must carry the key in every request, not just the first.
SCS-C02 Data Protection Practice Question
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 encrypt data stored in Amazon S3 using server-side encryption with customer-provided keys (SSE-C). Which statement is correct regarding SSE-C?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The customer provides the encryption key in each request to S3.
SSE-C requires the customer to provide the encryption key and its MD5 digest in every PUT or GET request to Amazon S3. S3 uses the key to encrypt the object at rest and then discards the key; it is never stored by AWS. This ensures the customer retains full control over the encryption key material.
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.
✓
The customer provides the encryption key in each request to S3.
Why this is correct
With SSE-C, you must include the encryption key in each request to upload or download an object.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS manages the encryption keys.
Why it's wrong here
With SSE-C, the customer provides and manages the encryption keys.
✗
The same encryption key is used for all objects in the bucket.
Why it's wrong here
Customer can use different keys per object; key is provided per request.
✗
The encryption key is stored in AWS KMS.
Why it's wrong here
SSE-C does not use KMS; the customer provides the key in the request.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse SSE-C with SSE-S3 or SSE-KMS, assuming AWS manages the keys or that keys are stored in KMS, when in fact SSE-C requires the customer to supply the key with every request and AWS never retains it.
Detailed technical explanation
How to think about this question
Under the hood, S3 uses the customer-provided key to perform envelope encryption: it generates a random data key, encrypts the object with that data key, then encrypts the data key with the customer-provided key. The encrypted data key is stored alongside the object metadata, but the customer-provided key itself is never stored. This design means the customer must supply the same key for decryption, and S3 validates the key using its MD5 hash to ensure integrity.
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.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The customer provides the encryption key in each request to S3. — SSE-C requires the customer to provide the encryption key and its MD5 digest in every PUT or GET request to Amazon S3. S3 uses the key to encrypt the object at rest and then discards the key; it is never stored by AWS. This ensures the customer retains full control over the encryption key material.
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 →
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 company wants to protect data stored in Amazon S3 by encrypting it at rest using keys managed by the company. Which encryption option should be used?
easy
A.SSE-KMS
✓ B.SSE-C
C.Client-side encryption
D.SSE-S3
Why B: Option B is correct because SSE-C allows the customer to provide and manage their own encryption keys. Option A is wrong because SSE-S3 uses AWS-managed keys. Option C is wrong because SSE-KMS uses AWS KMS managed keys. Option D is wrong because client-side encryption is not an S3 server-side encryption option.
Last reviewed: Jun 24, 2026
Question Discussion
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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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