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CCSP Practice Question: Implementing a cloud key management system (KMS)…
A company is implementing a cloud key management system (KMS) to control encryption keys for sensitive data. Which practice is essential to ensure the security of the keys?
⚠ Common exam trap
ISC2 often tests the misconception that key rotation is optional or that storing keys in the same region as data is a security best practice, when in fact rotation is a mandatory control for key hygiene and regional separation is a common architectural pattern for isolation.
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
✓
Periodically rotate the encryption keys.
Periodic key rotation is essential because it limits the amount of data encrypted under a single key, reducing the impact of a key compromise and complying with cryptographic best practices (e.g., NIST SP 800-57). In a cloud KMS, rotation can be automated using key versions, where old keys are retained for decryption while new keys are used for encryption, ensuring forward secrecy and operational security.
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 a single key for all encryption operations to simplify management.
Why it's wrong here
Using a single key increases risk; should use multiple keys for different data.
- ✗
Export keys to the cloud provider's hardware security module (HSM).
Why it's wrong here
Exporting keys can be risky; KMS usually generates keys within the HSM.
- ✗
Store encryption keys in the same region as the encrypted data.
Why it's wrong here
Geographic proximity does not enhance security.
- ✓
Periodically rotate the encryption keys.
Why this is correct
Key rotation limits the lifetime of exposed keys.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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