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CCSP Practice Question: Storing sensitive customer data in an S3 bucket
A company is storing sensitive customer data in an S3 bucket. They need to ensure data is encrypted at rest and that the encryption keys are managed by the cloud provider. Which encryption strategy should they use?
⚠ Common exam trap
ISC2 often tests the distinction between 'managed by the provider' and 'managed by the customer' — candidates confuse SSE-KMS (customer-managed KMS keys) with provider-managed keys, but SSE-KMS still gives the customer control over key lifecycle, making SSE-S3 the only option where the provider fully manages keys.
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
✓
SSE-S3 (Server-Side Encryption with S3-Managed Keys)
SSE-S3 (Server-Side Encryption with S3-Managed Keys) encrypts data at rest using AES-256, with the encryption keys fully managed by AWS. This meets the requirement for the cloud provider to handle key management without any customer involvement in key generation, storage, or rotation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SSE-C (Server-Side Encryption with Customer-Provided Keys)
Why it's wrong here
SSE-C uses customer-provided keys, not provider-managed.
- ✗
Client-side encryption
Why it's wrong here
Client-side encryption encrypts data before sending to cloud, not server-side encryption.
- ✗
SSE-KMS (Server-Side Encryption with AWS KMS)
Why it's wrong here
SSE-KMS uses customer-managed keys via KMS, not provider-managed.
- ✓
SSE-S3 (Server-Side Encryption with S3-Managed Keys)
Why this is correct
SSE-S3 uses keys managed by AWS, meeting the requirement.
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 |
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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.