This CCSP practice question tests your understanding of cloud data security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 financial institution uses a cloud-based data warehouse to store customer transaction records. They must comply with a regulation that requires deletion of data after 7 years. Which approach should they use to ensure data is irrecoverably destroyed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Encrypt the data and then destroy the encryption keys (cryptographic erasure)
Cryptographic erasure (Option B) is the correct approach because it renders the encrypted data irrecoverable by securely destroying the encryption keys, making the ciphertext permanently undecipherable. This method is recognized by standards like NIST SP 800-88 as an effective sanitization technique for data at rest, especially in cloud environments where physical access to storage media is unavailable. It ensures compliance with the 7-year deletion requirement without needing to overwrite or physically destroy the underlying cloud storage.
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.
✗
Overwrite the data with multiple patterns of zeros and ones
Why it's wrong here
Overwriting may not be reliable in virtualized cloud storage with snapshots and copies.
✓
Encrypt the data and then destroy the encryption keys (cryptographic erasure)
Why this is correct
Cryptographic erasure renders data unreadable without keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Tokenize the data and retain the token mapping
Why it's wrong here
Tokenization does not destroy the original data.
✗
Delete the data using the cloud provider's API and remove pointers
Why it's wrong here
API deletion may not remove all residual copies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that simply deleting data via the cloud provider's API or overwriting data is sufficient for irrecoverable destruction, but the trap is that cloud storage systems maintain multiple copies, snapshots, and version histories that are not addressed by these methods, making cryptographic erasure the only practical option for compliance.
Detailed technical explanation
How to think about this question
Cryptographic erasure leverages the fact that modern encryption algorithms (e.g., AES-256) produce ciphertext that is computationally infeasible to decrypt without the key. By securely deleting the key using a method like NIST SP 800-88 Clear or Purge (e.g., overwriting the key storage with zeros or using a secure key management service like AWS KMS with key deletion), the ciphertext becomes effectively random noise. In a real-world scenario, a financial institution using Amazon Redshift or Snowflake must ensure that all copies of the key (including backups and key management logs) are destroyed, as any residual key copy could allow recovery.
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 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
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.
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Encrypt the data and then destroy the encryption keys (cryptographic erasure) — Cryptographic erasure (Option B) is the correct approach because it renders the encrypted data irrecoverable by securely destroying the encryption keys, making the ciphertext permanently undecipherable. This method is recognized by standards like NIST SP 800-88 as an effective sanitization technique for data at rest, especially in cloud environments where physical access to storage media is unavailable. It ensures compliance with the 7-year deletion requirement without needing to overwrite or physically destroy the underlying cloud storage.
What should I do if I get this CCSP 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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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.
Question Discussion
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