DEA-C01 Data Store Management Practice Question
Exhibit
Refer to the exhibit.
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": ["kms:Decrypt", "kms:Encrypt"],
"Resource": "arn:aws:kms:us-east-1:123456789012:key/abc123"
},
{
"Effect": "Deny",
"Action": ["kms:Decrypt"],
"Resource": "arn:aws:kms:us-east-1:123456789012:key/abc123",
"Condition": {
"StringNotEquals": {
"kms:ViaService": "s3.us-east-1.amazonaws.com"
}
}
}
]
}
```Refer to the exhibit. An IAM policy is attached to an IAM role used by an application. The application needs to decrypt objects in an S3 bucket using a customer managed KMS key. What is the effect of this policy?
⚠ Common exam trap
AWS often tests the `kms:ViaService` condition key to trap candidates who assume that granting `kms:Decrypt` alone allows decryption from any source, ignoring the service-specific restriction.
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 application can decrypt objects only when accessing them through S3.
The IAM policy grants the `kms:Decrypt` permission with a `kms:ViaService` condition key set to `s3.amazonaws.com`. This condition restricts the decryption operation to only when the request is made through the S3 service. Therefore, the application can decrypt objects only when accessing them through S3, not via direct KMS API calls or other services.
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 application cannot perform any KMS operations.
Why it's wrong here
Encrypt is allowed; decrypt is allowed via S3.
- ✗
The application can decrypt objects from any service.
Why it's wrong here
Decrypt is denied if not via S3.
- ✓
The application can decrypt objects only when accessing them through S3.
Why this is correct
The Deny with condition allows decrypt only via S3 service.
- ✗
The application can encrypt but not decrypt objects.
Why it's wrong here
Encrypt is allowed; decrypt is allowed only via S3.
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
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