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CCSP Practice Question: A cloud security team is implementing…
A cloud security team is implementing tokenization for a payment system. Which THREE statements correctly describe tokenization characteristics?
⚠ Common exam trap
ISC2 often tests the misconception that tokenization is a form of encryption, but the key distinction is that tokenization uses a lookup table (vault) rather than a mathematical algorithm, making it non-reversible without vault access.
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
✓
The original sensitive data is stored in a secure token vault.
Option B is correct because tokenization requires a secure token vault (a protected data store, often encrypted and access-controlled) that maps each token back to its original sensitive value, such as a PAN, so the real data is never held in the transaction environment. Option C is correct because a token is a randomly generated surrogate value (for example, a 16-digit number) that has no mathematical or algorithmic relationship to the original data, unlike ciphertext produced by encryption. Option D is correct because the token can be passed through payment and business processes in place of the real data, allowing transactions to complete without exposing the original sensitive value. Option A is not correct as stated because tokenization itself is a substitution technique, not an encryption algorithm, even though encryption is often used to protect the vault. Option E is not correct because detokenization requires access to the token vault and its mapping; the token alone cannot reverse the process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Tokenization uses encryption algorithms to protect data.
Why it's wrong here
Tokenization substitutes a non-sensitive surrogate value with no mathematical relationship to the original, so it does not use encryption algorithms. It is tempting because both tokenization and encryption protect data, but encryption is reversible with a key whereas tokenization relies on a mapping vault.
- ✓
The original sensitive data is stored in a secure token vault.
Why this is correct
Tokenisation replaces sensitive data with a token and stores the original value in a secured token vault, which is the only place the mapping can be reversed. The vault therefore becomes a high-value asset requiring strict access controls and encryption.
- ✓
The token is a randomly generated string with no mathematical relationship to the original data.
Why this is correct
Tokens are randomly generated values carrying no mathematical relationship to the original data, unlike encryption, where ciphertext is derived from plaintext via a key. This means a token cannot be reversed computationally; only the vault mapping can retrieve the original value.
- ✓
Tokens can be used for transactions without exposing the original data.
Why this is correct
Tokenisation substitutes a surrogate value for the primary account number, so the payment system processes transactions using the token alone. The original data never enters the transaction flow, satisfying the requirement that sensitive card data remains protected while still enabling authorisation and settlement.
- ✗
Tokenization is reversible using the token alone.
Why it's wrong here
Tokenization replaces data with a surrogate that maps back to the original only via a separate, protected token vault; the token alone carries no reversible information. It is tempting because format-preserving tokens resemble the original data, but that similarity is structural, not cryptographic — reversibility requires vault lookup, not the token itself.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.