This CCSP practice question tests your understanding of cloud data security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Exhibit
Refer to the exhibit.
```
Error: Access Denied.
status code: 403, request id: QWERTY1234, host id: ABCD5678
User: arn:aws:iam::123456789012:user/data-analyst
Action: s3:GetObject
Resource: arn:aws:s3:::proprietary-data/reports/q4-2023.csv
Additional detail: Encryption key access required.
```
An analyst receives the above error when trying to download a file from an S3 bucket. The bucket policy and user permissions appear correct. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user lacks permission to decrypt the object using the KMS key
When an S3 object is encrypted with a customer-managed KMS key (SSE-KMS), the s3:GetObject API call requires the user to have both s3:GetObject permission on the bucket policy and kms:Decrypt permission on the specific KMS key. Even if the bucket policy and user IAM permissions appear correct for S3 actions, the absence of the KMS decrypt grant will cause an access denied error. This is a common misconfiguration because the error message does not explicitly mention KMS, leading analysts to overlook the key permission.
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 object is encrypted with SSE-S3, which requires additional grants
Why it's wrong here
SSE-S3 does not require key access; SSE-KMS does.
✗
The bucket is configured to block all public access
Why it's wrong here
Block public access would give a different error.
✗
The bucket policy denies all s3:GetObject actions
Why it's wrong here
Error says encryption key access required, not a bucket policy deny.
✓
The user lacks permission to decrypt the object using the KMS key
Why this is correct
The error indicates missing KMS decrypt permission.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that S3 bucket policies and IAM permissions alone control access to encrypted objects, ignoring the separate KMS permission layer required for SSE-KMS encrypted objects.
Detailed technical explanation
How to think about this question
AWS KMS integrates with S3 via the kms:Decrypt permission, which must be explicitly granted in a KMS key policy or IAM policy. When an S3 object is encrypted with SSE-KMS, the GetObject call triggers a Decrypt API call to KMS, and if the user lacks the kms:Decrypt permission, the request fails with a 403 AccessDenied error, even though the S3 permissions are valid. This is a subtle but critical distinction because the error message does not differentiate between S3 and KMS permission failures, often leading to confusion during troubleshooting.
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 user lacks permission to decrypt the object using the KMS key — When an S3 object is encrypted with a customer-managed KMS key (SSE-KMS), the s3:GetObject API call requires the user to have both s3:GetObject permission on the bucket policy and kms:Decrypt permission on the specific KMS key. Even if the bucket policy and user IAM permissions appear correct for S3 actions, the absence of the KMS decrypt grant will cause an access denied error. This is a common misconfiguration because the error message does not explicitly mention KMS, leading analysts to overlook the key permission.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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