- A
Deny PutObject unless s3:x-amz-server-side-encryption equals "aws:kms" and s3:x-amz-server-side-encryption-aws-kms-key-id equals the required CMK ARN
This enforces the encryption choice at upload time by validating the request headers that specify SSE-KMS and the exact KMS key ID/ARN. Using a Deny condition ensures uploads that do not include the correct SSE-KMS headers (for example, unencrypted uploads or uploads using a different KMS key) are rejected immediately.
- B
Allow PutObject only when aws:SecureTransport is true; encryption is then guaranteed automatically
Why wrong: aws:SecureTransport only controls that the request uses HTTPS (TLS in transit). It does not ensure server-side encryption at rest in S3 or that SSE-KMS with the mandated CMK is used.
- C
Deny PutObject if the request includes Content-Type other than "application/octet-stream"
Why wrong: Content-Type is an application/content metadata header and has no direct relationship to whether S3 encrypts the object with SSE-KMS or which KMS key is used.
- D
Deny PutObject when the caller’s role is not allowed to kms:Decrypt in their IAM policy
Why wrong: kms:Decrypt permissions relate to decrypting objects later (for example, after retrieval or during operations that require decryption). They do not control whether S3 accepts the PutObject request using the required SSE-KMS configuration and CMK at upload time.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 security team requires that every object uploaded to s3://secure-bucket/uploads/ must be encrypted using SSE-KMS with a specific customer-managed KMS key. Which S3 bucket policy condition approach best enforces this requirement for PutObject requests?
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
Deny PutObject unless s3:x-amz-server-side-encryption equals "aws:kms" and s3:x-amz-server-side-encryption-aws-kms-key-id equals the required CMK ARN
Option A is correct because it uses a Deny effect with the s3:x-amz-server-side-encryption condition key set to 'aws:kms' and the s3:x-amz-server-side-encryption-aws-kms-key-id condition key set to the specific customer-managed KMS key ARN. This ensures that any PutObject request that does not include both the required encryption header and the exact KMS key identifier is denied, enforcing the encryption requirement at the bucket policy level.
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.
- ✓
Deny PutObject unless s3:x-amz-server-side-encryption equals "aws:kms" and s3:x-amz-server-side-encryption-aws-kms-key-id equals the required CMK ARN
Why this is correct
This enforces the encryption choice at upload time by validating the request headers that specify SSE-KMS and the exact KMS key ID/ARN. Using a Deny condition ensures uploads that do not include the correct SSE-KMS headers (for example, unencrypted uploads or uploads using a different KMS key) are rejected immediately.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Allow PutObject only when aws:SecureTransport is true; encryption is then guaranteed automatically
Why it's wrong here
aws:SecureTransport only controls that the request uses HTTPS (TLS in transit). It does not ensure server-side encryption at rest in S3 or that SSE-KMS with the mandated CMK is used.
When this WOULD be correct
This would be correct if the question required enforcing encryption in transit for all S3 uploads, e.g., 'Ensure all PutObject requests use HTTPS.' Then a Deny with aws:SecureTransport false would be appropriate.
- ✗
Deny PutObject if the request includes Content-Type other than "application/octet-stream"
Why it's wrong here
Content-Type is an application/content metadata header and has no direct relationship to whether S3 encrypts the object with SSE-KMS or which KMS key is used.
When this WOULD be correct
If the question required that only binary files (e.g., application/octet-stream) be uploaded to a specific bucket, a Deny policy on other Content-Type values would enforce that rule.
- ✗
Deny PutObject when the caller’s role is not allowed to kms:Decrypt in their IAM policy
Why it's wrong here
kms:Decrypt permissions relate to decrypting objects later (for example, after retrieval or during operations that require decryption). They do not control whether S3 accepts the PutObject request using the required SSE-KMS configuration and CMK at upload time.
When this WOULD be correct
Option D would be correct in a scenario where the requirement is to prevent uploads by users who cannot decrypt objects in the bucket (e.g., to ensure only authorized decryptors can upload). For example: 'A security policy requires that only users with permission to decrypt objects using a specific KMS key can upload to the bucket.'
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Deny PutObject unless s3:x-amz-server-side-encryption equals "aws:kms" and s3:x-amz-server-side-encryption-aws-kms-key-id equals the required CMK ARNCorrect answer▾
Why this is correct
This enforces the encryption choice at upload time by validating the request headers that specify SSE-KMS and the exact KMS key ID/ARN. Using a Deny condition ensures uploads that do not include the correct SSE-KMS headers (for example, unencrypted uploads or uploads using a different KMS key) are rejected immediately.
✗Allow PutObject only when aws:SecureTransport is true; encryption is then guaranteed automaticallyWrong answer — click to see why▾
Why this is wrong here
This option only enforces SecureTransport (HTTPS), not encryption at rest. It does not require SSE-KMS or a specific KMS key, so objects could be uploaded without server-side encryption or with a different encryption method.
★ When this WOULD be the correct answer
This would be correct if the question required enforcing encryption in transit for all S3 uploads, e.g., 'Ensure all PutObject requests use HTTPS.' Then a Deny with aws:SecureTransport false would be appropriate.
Why candidates choose this
Candidates may confuse encryption in transit (HTTPS) with encryption at rest (SSE), or assume that requiring HTTPS automatically enforces server-side encryption, which is not true.
✗Deny PutObject if the request includes Content-Type other than "application/octet-stream"Wrong answer — click to see why▾
Why this is wrong here
This condition restricts Content-Type, not encryption. The requirement is about SSE-KMS encryption, not the MIME type of the object.
★ When this WOULD be the correct answer
If the question required that only binary files (e.g., application/octet-stream) be uploaded to a specific bucket, a Deny policy on other Content-Type values would enforce that rule.
Why candidates choose this
Candidates may confuse content restrictions with encryption requirements, or think that controlling Content-Type is a way to enforce data format standards that indirectly relate to security.
✗Deny PutObject when the caller’s role is not allowed to kms:Decrypt in their IAM policyWrong answer — click to see why▾
Why this is wrong here
Option D is wrong because the question requires encryption with a specific KMS key, not decryption permissions. Denying PutObject based on the caller's inability to decrypt does not enforce the use of the required KMS key for encryption; it only checks decryption capability, which is irrelevant for uploads.
★ When this WOULD be the correct answer
Option D would be correct in a scenario where the requirement is to prevent uploads by users who cannot decrypt objects in the bucket (e.g., to ensure only authorized decryptors can upload). For example: 'A security policy requires that only users with permission to decrypt objects using a specific KMS key can upload to the bucket.'
Why candidates choose this
Candidates may confuse encryption and decryption permissions, thinking that requiring kms:Decrypt for uploads somehow enforces encryption, or they may assume that KMS key permissions are symmetric for encrypt and decrypt operations.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse encryption in transit (aws:SecureTransport) with encryption at rest (SSE-KMS), or they mistakenly think that checking the caller's KMS permissions in the bucket policy is sufficient, when in fact the policy must inspect the request headers to enforce the encryption requirement.
Detailed technical explanation
How to think about this question
Under the hood, S3 evaluates bucket policy conditions before processing the PutObject request; the s3:x-amz-server-side-encryption-aws-kms-key-id condition key matches the value of the x-amz-server-side-encryption-aws-kms-key-id header, which must be the full ARN of the CMK. A subtle behavior is that if the header is omitted entirely, the Deny will trigger because the condition key evaluates to false, effectively blocking unencrypted uploads. In a real-world scenario, this policy is critical for compliance frameworks like PCI-DSS or HIPAA, where data must be encrypted with a key under the organization's control.
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.
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 |
What to study next
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deny PutObject unless s3:x-amz-server-side-encryption equals "aws:kms" and s3:x-amz-server-side-encryption-aws-kms-key-id equals the required CMK ARN — Option A is correct because it uses a Deny effect with the s3:x-amz-server-side-encryption condition key set to 'aws:kms' and the s3:x-amz-server-side-encryption-aws-kms-key-id condition key set to the specific customer-managed KMS key ARN. This ensures that any PutObject request that does not include both the required encryption header and the exact KMS key identifier is denied, enforcing the encryption requirement at the bucket policy level.
What should I do if I get this SAA-C03 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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Last reviewed: Jun 11, 2026
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