This CCSP practice question tests your understanding of cloud data security. 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 cloud administrator is rotating encryption keys for a data storage service. The administrator wants to ensure that previously encrypted data remains accessible after the rotation. What is the best practice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Delete the old key after rotation
Why wrong: Data encrypted with old key becomes unreadable.
Retain the old key and use envelope encryption so the new key can decrypt the old key
Old keys are kept but not active; new wrapped keys allow access.
Re-encrypt all data with the new key immediately
Why wrong: Not practical for large volumes.
Disable the old key and only use the new key for new writes
Why wrong: Old data becomes inaccessible.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Retain the old key and use envelope encryption so the new key can decrypt the old key
Envelope encryption allows the new key to decrypt the old key, which in turn decrypts the data. This ensures that previously encrypted data remains accessible without re-encrypting it, as the old key is retained and protected under the new key. This is the best practice for key rotation in cloud storage services like AWS KMS or Azure Key Vault.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Delete the old key after rotation
Why it's wrong here
Data encrypted with old key becomes unreadable.
Retain the old key and use envelope encryption so the new key can decrypt the old key
Why this is correct
Old keys are kept but not active; new wrapped keys allow access.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Re-encrypt all data with the new key immediately
Why it's wrong here
Not practical for large volumes.
Disable the old key and only use the new key for new writes
Why it's wrong here
Old data becomes inaccessible.
Common exam traps
ISC2 often tests the misconception that key rotation requires immediate re-encryption of all data, but the correct approach is to retain old keys and use envelope encryption to maintain access without re-encryption.
Detailed technical explanation
Envelope encryption works by using a key encryption key (KEK) to wrap data encryption keys (DEKs). During rotation, the new KEK encrypts the old DEK, so the new KEK can unwrap the old DEK to decrypt data. This is implemented in services like AWS KMS with automatic key rotation, where old backing keys are retained and re-wrapped under the new key material, ensuring zero downtime and no data re-encryption.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
The correct answer is: Retain the old key and use envelope encryption so the new key can decrypt the old key — Envelope encryption allows the new key to decrypt the old key, which in turn decrypts the data. This ensures that previously encrypted data remains accessible without re-encrypting it, as the old key is retained and protected under the new key. This is the best practice for key rotation in cloud storage services like AWS KMS or Azure Key Vault.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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