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 cloud application processes credit card numbers. To reduce PCI DSS scope, the company wants to remove the original PAN from its databases and use a surrogate value that can be reversed only by a privileged application. Which data protection technique should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Tokenization using a cloud-based token vault
Tokenization replaces the original PAN with a randomly generated surrogate value (token) that has no mathematical relationship to the original data. The token can be reversed only by a privileged application that has access to the token vault, which stores the mapping between tokens and actual PANs. This effectively removes the PAN from the application's databases, reducing PCI DSS scope because the tokenized data is not considered sensitive cardholder data.
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.
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Truncation of the first 6 and last 4 digits
Why it's wrong here
Truncation loses data permanently and not reversible.
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Dynamic data masking in the application tier
Why it's wrong here
Masking is for display and does not remove the original value.
✓
Tokenization using a cloud-based token vault
Why this is correct
Tokenization replaces PAN with a token and the token vault controls detokenization.
Related concept
Read the scenario before looking for a memorised answer.
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Symmetric encryption with a key stored in the database
Why it's wrong here
Encryption allows reversal but key storage increases risk.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between tokenization and encryption, where candidates mistakenly choose symmetric encryption (Option D) because they think encryption alone removes data from scope, but PCI DSS requires that the decryption key be stored separately from the encrypted data, and even then, encrypted PANs are still considered cardholder data unless the key is managed by a third-party service.
Detailed technical explanation
How to think about this question
Tokenization typically uses a cloud-based token vault that generates tokens via a cryptographically secure random number generator (CSPRNG) and stores the PAN-to-token mapping in a hardened, isolated database. The token itself is often format-preserving (e.g., same length and character set as a PAN) to allow legacy systems to accept it without schema changes, but it has no mathematical relationship to the original PAN, making it irreversible without access to the vault. In real-world scenarios, tokenization is preferred over encryption for PCI DSS scope reduction because the token is not considered cardholder data, whereas encrypted PANs still fall under PCI DSS requirements if the decryption key is accessible within the same environment.
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: Tokenization using a cloud-based token vault — Tokenization replaces the original PAN with a randomly generated surrogate value (token) that has no mathematical relationship to the original data. The token can be reversed only by a privileged application that has access to the token vault, which stores the mapping between tokens and actual PANs. This effectively removes the PAN from the application's databases, reducing PCI DSS scope because the tokenized data is not considered sensitive cardholder data.
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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Question Discussion
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