Will an IAM Policy Allow Download of SSE-S3 Encrypted Objects?
This SAP-C02 practice question tests your understanding of design for new solutions. 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 company has an IAM policy attached to a user. The user is trying to download an object from the S3 bucket 'my-bucket' that was uploaded with SSE-S3 encryption. What will happen?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user will be allowed to download the object.
Option C is correct because SSE-S3 uses AES-256 encryption managed by Amazon S3, and the encryption/decryption process is transparent to the user. When a user has the s3:GetObject permission in their IAM policy, they can download the object regardless of SSE-S3 encryption, as S3 automatically decrypts the object upon retrieval. The IAM policy does not require any additional conditions for SSE-S3, so the user is allowed to download the object.
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 user will be allowed only if the object was uploaded with SSE-KMS.
Why it's wrong here
The condition checks for AES256, not KMS.
✗
The user will be denied access because the condition is not met.
Why it's wrong here
The condition is met because the object uses SSE-S3.
✓
The user will be allowed to download the object.
Why this is correct
The condition requires SSE-S3 (AES256), which matches the object's encryption.
Related concept
Read the scenario before looking for a memorised answer.
✗
The user will be denied because SSE-S3 is not AES256.
Why it's wrong here
SSE-S3 uses AES256.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SSE-S3 with SSE-KMS and assume that any server-side encryption requires additional IAM conditions or KMS permissions, but SSE-S3 is fully transparent to the user and does not impose any such requirements.
Detailed technical explanation
How to think about this question
SSE-S3 (Server-Side Encryption with S3-Managed Keys) uses AES-256 encryption, and the encryption key is managed entirely by AWS. When a GET request is made, S3 decrypts the object transparently using the same key, so no client-side key management or additional IAM conditions are needed. This contrasts with SSE-KMS, where the user must have kms:Decrypt permission on the KMS key, and SSE-C, where the user must provide the encryption key in the request.
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
Symmetric Encryption Algorithm Comparison
Algorithm
Key Size
Block Size
Status
Notes
AES-128
128-bit
128-bit
Current standard
NIST approved; WPA3, TLS
AES-256
256-bit
128-bit
Current standard
Preferred for sensitive / govt data
3DES
112-bit effective
64-bit
Deprecated (2023)
Replaced by AES
DES
56-bit
64-bit
Broken
Cracked in < 24 h; never deploy
ChaCha20
256-bit
Stream cipher
Current
TLS 1.3, WireGuard
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.
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user will be allowed to download the object. — Option C is correct because SSE-S3 uses AES-256 encryption managed by Amazon S3, and the encryption/decryption process is transparent to the user. When a user has the s3:GetObject permission in their IAM policy, they can download the object regardless of SSE-S3 encryption, as S3 automatically decrypts the object upon retrieval. The IAM policy does not require any additional conditions for SSE-S3, so the user is allowed to download the object.
What should I do if I get this SAP-C02 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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Question Discussion
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