easyMultiple ChoiceObjective-mapped
CCSP What does this bucket policy enforce? Practice Question
Exhibit
Refer to the exhibit.
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Deny",
"Principal": "*",
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::mybucket/*",
"Condition": {
"StringNotEquals": {
"s3:x-amz-server-side-encryption": "aws:kms"
}
}
}
]
}What does this bucket policy enforce?
⚠ Common exam trap
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.
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
✓
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.
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'.
- ✗
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.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.