This CCSP practice question tests your understanding of cloud data security. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy denies all uploads unless they use SSE-KMS.
The bucket policy uses a Condition block with `s3:x-amz-server-side-encryption` set to `aws:kms`, which means any upload must include the `x-amz-server-side-encryption` header with the value `aws:kms`. If the header is missing or set to any other value (e.g., `AES256` for SSE-S3), the request is denied. This enforces that all uploads use SSE-KMS, but does not require a specific KMS key unless a `kms:EncryptionContext` or `kms:KeyArn` condition is also present.
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 policy denies all uploads unless they use SSE-KMS.
Why this is correct
The Deny effect applies when the encryption is not 'aws:kms'.
Related concept
Read the scenario before looking for a memorised answer.
✗
All objects must be encrypted with a specific KMS key.
Why it's wrong here
The condition checks for the encryption method, not a specific key.
✗
Any object uploaded without encryption will be denied.
Why it's wrong here
The condition denies anything except SSE-KMS, so even SSE-S3 encryption would be denied.
✗
Only objects encrypted with SSE-S3 are allowed.
Why it's wrong here
SSE-S3 is not KMS, so those requests are denied.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between 'requiring SSE-KMS' and 'requiring a specific KMS key'—candidates mistakenly think that any SSE-KMS condition implies a specific key, but the policy only checks the encryption type, not the key ARN.
Detailed technical explanation
How to think about this question
Under the hood, the `s3:x-amz-server-side-encryption` condition key checks the value of the `x-amz-server-side-encryption` header in the PUT request. If the header is missing, the condition evaluates to false, and the Deny effect applies. A common subtlety is that if the bucket also has a default encryption setting of SSE-S3, the policy's explicit Deny overrides that default, causing uploads without the header to fail even though the bucket would normally apply SSE-S3 automatically. In real-world scenarios, this policy is used to enforce a security standard where all data must be encrypted with KMS for audit or compliance reasons, but it does not restrict which KMS key is used unless additional conditions are added.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
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.
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The policy denies all uploads unless they use SSE-KMS. — The bucket policy uses a Condition block with `s3:x-amz-server-side-encryption` set to `aws:kms`, which means any upload must include the `x-amz-server-side-encryption` header with the value `aws:kms`. If the header is missing or set to any other value (e.g., `AES256` for SSE-S3), the request is denied. This enforces that all uploads use SSE-KMS, but does not require a specific KMS key unless a `kms:EncryptionContext` or `kms:KeyArn` condition is also present.
What should I do if I get this CCSP 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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This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
Question Discussion
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