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 company needs to ensure that data stored in the cloud is securely deleted when no longer needed. Which TWO of the following are secure deletion methods? (Choose two.)
Cryptographic erasure (destroying encryption keys)
Without key, encrypted data is unrecoverable.
Deleting the file metadata
Why wrong: Data may still exist on disk.
Multiple overwrite of the storage blocks
Overwriting makes original data unrecoverable.
Wiping the swap space
Why wrong: Does not affect primary storage.
Degaussing the storage medium
Why wrong: Degaussing is for magnetic media, not typical cloud storage.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cryptographic erasure (destroying encryption keys)
Cryptographic erasure renders data unrecoverable by securely destroying the encryption keys used to encrypt the data at rest. Without the keys, the ciphertext becomes effectively indecipherable, even if the underlying storage blocks remain intact. This method is recognized by NIST SP 800-88 as a valid sanitization technique for cloud environments where physical access to storage is limited.
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.
Cryptographic erasure (destroying encryption keys)
Why this is correct
Without key, encrypted data is unrecoverable.
Related concept
Read the scenario before looking for a memorised answer.
Deleting the file metadata
Why it's wrong here
Data may still exist on disk.
Multiple overwrite of the storage blocks
Why this is correct
Overwriting makes original data unrecoverable.
Related concept
Read the scenario before looking for a memorised answer.
Wiping the swap space
Why it's wrong here
Does not affect primary storage.
Degaussing the storage medium
Why it's wrong here
Degaussing is for magnetic media, not typical cloud storage.
Common exam traps
ISC2 often tests the distinction between logical deletion (e.g., deleting metadata) and secure deletion, and candidates mistakenly choose 'deleting file metadata' because they confuse it with secure file deletion in operating systems, ignoring that cloud storage APIs do not guarantee physical block erasure.
Detailed technical explanation
Cryptographic erasure relies on the principle that data encrypted with a strong algorithm (e.g., AES-256) is computationally infeasible to decrypt without the key. In cloud scenarios, this is often implemented via key management services (e.g., AWS KMS, Azure Key Vault) where deleting the Customer Master Key (CMK) triggers automatic key retirement, rendering all associated ciphertext permanently unreadable. Multiple overwrite (Option C) is effective for magnetic hard drives but less reliable on SSDs due to wear-leveling and garbage collection, which can leave residual data; however, it remains a valid method per NIST guidelines when performed with verified patterns (e.g., DoD 5220.22-M).
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cloud Data Security — study guide chapter
Learn the concepts, then practise the questions
Cloud Data Security practice questions
Targeted practice on this topic area only
All CCSP questions
504 questions across all exam domains
Certified Cloud Security Professional CCSP study guide
Full concept coverage aligned to exam objectives
CCSP practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise CCSP questions linked to Cloud Application Security.
Practise CCSP questions linked to Cloud Security Operations.
Practise CCSP questions linked to Legal, Risk and Compliance.
Practise CCSP questions linked to Cloud Concepts, Architecture and Design.
Practise CCSP questions linked to Cloud Platform and Infrastructure Security.
Practise CCSP questions linked to Cloud Data Security.
Practise CCSP questions linked to CCSP fundamentals.
Practise CCSP questions linked to CCSP scenario.
Practise CCSP questions linked to CCSP troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
The correct answer is: Cryptographic erasure (destroying encryption keys) — Cryptographic erasure renders data unrecoverable by securely destroying the encryption keys used to encrypt the data at rest. Without the keys, the ciphertext becomes effectively indecipherable, even if the underlying storage blocks remain intact. This method is recognized by NIST SP 800-88 as a valid sanitization technique for cloud environments where physical access to storage is limited.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.