The answer is the `s3:x-amz-server-side-encryption-customer-key` condition key. This key enforces SSE-C by requiring the presence of the `x-amz-server-side-encryption-customer-key` header in every upload request; without it, the S3 bucket policy denies the request, ensuring all objects are encrypted at rest using a customer-provided key. On the AWS Certified Data Engineer Associate DEA-C01 exam, this tests your ability to distinguish between SSE-S3, SSE-KMS, and SSE-C encryption enforcement—a common trap is confusing this key with `s3:x-amz-server-side-encryption` (used for SSE-S3 or SSE-KMS). Remember that SSE-C is the only model where you supply the encryption key in the request header, so the policy condition must explicitly check for that customer-provided key header. A useful memory tip: "C is for Customer, so the key must contain 'customer-key' in its name."
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 company stores sensitive customer data in Amazon S3. The security team requires that all objects be encrypted at rest using server-side encryption with customer-provided keys (SSE-C). Which bucket policy condition will enforce this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
s3:x-amz-server-side-encryption-customer-key
Option C is correct because the condition key `s3:x-amz-server-side-encryption-customer-key` is specifically used to enforce that objects uploaded to S3 must use server-side encryption with customer-provided keys (SSE-C). This condition key checks for the presence of the `x-amz-server-side-encryption-customer-key` header in the request, which is required for SSE-C encryption. Without this header, the request is denied, ensuring all objects are encrypted at rest using customer-provided keys.
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.
✗
s3:x-amz-server-side-encryption-aws-kms-key-id
Why it's wrong here
This condition is for SSE-KMS, not SSE-C.
✗
s3:x-amz-server-side-encryption
Why it's wrong here
This condition key is used for SSE-S3 or SSE-KMS, not SSE-C.
✓
s3:x-amz-server-side-encryption-customer-key
Why this is correct
This condition key enforces the use of a customer-provided encryption key.
Related concept
Read the scenario before looking for a memorised answer.
While related, the condition to enforce SSE-C typically uses the customer-key header.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between condition keys that enforce the encryption method (SSE-S3, SSE-KMS, SSE-C) versus those that enforce specific parameters like the key ID or algorithm, leading candidates to confuse `s3:x-amz-server-side-encryption-customer-algorithm` with the key requirement.
Detailed technical explanation
How to think about this question
SSE-C requires the client to provide an encryption key and the MD5 hash of that key in the request headers (`x-amz-server-side-encryption-customer-key` and `x-amz-server-side-encryption-customer-key-MD5`). The condition key `s3:x-amz-server-side-encryption-customer-key` evaluates the presence of the customer key header, not its value, making it the correct choice for enforcing SSE-C usage. A subtle behavior is that S3 does not store the customer-provided key; it only uses it to encrypt the object and discards it, so the condition key ensures the key is provided with every request.
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 Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: s3:x-amz-server-side-encryption-customer-key — Option C is correct because the condition key `s3:x-amz-server-side-encryption-customer-key` is specifically used to enforce that objects uploaded to S3 must use server-side encryption with customer-provided keys (SSE-C). This condition key checks for the presence of the `x-amz-server-side-encryption-customer-key` header in the request, which is required for SSE-C encryption. Without this header, the request is denied, ensuring all objects are encrypted at rest using customer-provided keys.
What should I do if I get this DEA-C01 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.
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Question Discussion
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