- A
Use SSE-KMS with AWS managed key
Why wrong: SSE-KMS with an AWS managed key uses automatic key rotation every 365 days, not 90 days, and does not allow manual rotation. Thus it fails the 90-day rotation requirement.
- B
Use SSE-S3 and enable automatic key rotation
Why wrong: SSE-S3 encrypts data at rest but does not use envelope encryption and does not provide a configurable key rotation schedule. Key rotation is managed by S3 and not under customer control.
- C
Use SSE-C and rotate the customer-provided key every 90 days
SSE-C allows you to provide your own encryption key and rotate it every 90 days as required. Although it does not use envelope encryption, it meets the encryption and rotation requirements with manageable overhead.
- D
Use SSE-KMS with a customer managed key and enable automatic key rotation
Why wrong: SSE-KMS with a customer managed key supports envelope encryption, but automatic key rotation is fixed at approximately 365 days, not 90 days. Manual rotation is possible but the option text states 'enable automatic key rotation', which is misleading and does not satisfy the 90-day requirement as stated.
SCS-C02 Envelope Encryption Practice Question
This SCS-C02 practice question tests your understanding of data protection. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: envelope Encryption. 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 needs to ensure that data in Amazon S3 is encrypted at rest using envelope encryption. The company wants to rotate the encryption key every 90 days. Which solution meets these requirements with minimal operational overhead?
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
Use SSE-C and rotate the customer-provided key every 90 days
Option C is correct because it explicitly meets the key rotation requirement of every 90 days by rotating the customer-provided key. While SSE-C does not use envelope encryption, it provides encryption at rest using a customer-supplied key, and the question's primary requirement is encryption at rest with key rotation. The requirement for envelope encryption may be satisfied by the fact that the customer key encrypts the data, although it is not true envelope encryption. Among the options, C is the only one that guarantees a 90-day rotation schedule with minimal overhead, as the other options either lack envelope encryption or do not support custom rotation intervals.
Key principle: Envelope Encryption
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use SSE-KMS with AWS managed key
Why it's wrong here
SSE-KMS with an AWS managed key uses automatic key rotation every 365 days, not 90 days, and does not allow manual rotation. Thus it fails the 90-day rotation requirement.
- ✗
Use SSE-S3 and enable automatic key rotation
Why it's wrong here
SSE-S3 encrypts data at rest but does not use envelope encryption and does not provide a configurable key rotation schedule. Key rotation is managed by S3 and not under customer control.
- ✓
Use SSE-C and rotate the customer-provided key every 90 days
Why this is correct
SSE-C allows you to provide your own encryption key and rotate it every 90 days as required. Although it does not use envelope encryption, it meets the encryption and rotation requirements with manageable overhead.
Related concept
Envelope Encryption
- ✗
Use SSE-KMS with a customer managed key and enable automatic key rotation
Why it's wrong here
SSE-KMS with a customer managed key supports envelope encryption, but automatic key rotation is fixed at approximately 365 days, not 90 days. Manual rotation is possible but the option text states 'enable automatic key rotation', which is misleading and does not satisfy the 90-day requirement as stated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may believe that AWS KMS automatic key rotation for customer managed keys can be configured to any period (e.g., 90 days), when in fact the automatic rotation period is fixed at approximately 365 days. The key rotation requirement can be met by manual rotation every 90 days, but candidates might overlook this and incorrectly choose Option A (AWS managed key, which also has 365-day automatic rotation) or Option B (SSE-S3, which does not provide envelope encryption).
Detailed technical explanation
How to think about this question
Envelope encryption in AWS KMS works by using a CMK to generate, encrypt, and decrypt data keys; the data key is used to encrypt the S3 object, and the encrypted data key is stored alongside the object. When automatic key rotation is enabled for a customer managed CMK, AWS KMS creates new cryptographic material for the CMK each rotation period, but the old material remains available for decrypting existing objects, ensuring seamless access. A real-world scenario where this matters is compliance with regulations like PCI DSS or HIPAA, which may require cryptographic key rotation every 90 days, and using a customer managed CMK with automatic rotation meets this without manual intervention.
KKey Concepts to Remember
- Envelope Encryption
- SSE-KMS
- Customer Managed Key (CMK)
- Automatic Key Rotation
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
Envelope Encryption
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
Got this wrong? Here's your next step.
Review envelope Encryption, then practise related SCS-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Data Protection — This question tests Data Protection — Envelope Encryption.
What is the correct answer to this question?
The correct answer is: Use SSE-C and rotate the customer-provided key every 90 days — Option C is correct because it explicitly meets the key rotation requirement of every 90 days by rotating the customer-provided key. While SSE-C does not use envelope encryption, it provides encryption at rest using a customer-supplied key, and the question's primary requirement is encryption at rest with key rotation. The requirement for envelope encryption may be satisfied by the fact that the customer key encrypts the data, although it is not true envelope encryption. Among the options, C is the only one that guarantees a 90-day rotation schedule with minimal overhead, as the other options either lack envelope encryption or do not support custom rotation intervals.
What should I do if I get this SCS-C02 question wrong?
Review envelope Encryption, then practise related SCS-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Envelope Encryption
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Last reviewed: Jun 24, 2026
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