Tokenization

Question 1

What is required for tokenization systems to be PCI-compliant

Answer 1

A tokenization system must:

• Replace the PAN with a non-sensitive token.
• Ensure the token cannot be mathematically reversed.
• Protect the mapping between PAN and token in a secured, PCI -scoped vault
• Use strong cryptography and controls for the vault.
• Restrict access to the tokenization system.
• Use secure APIs and encryption in transit and at rest.
• Maintain full PCI controls for the token vault environment

Question 2

True or False? Systems using tokens instead of PAN are out of PCI scope?

Answer 2

False. Use of tokens reduces the PCI scope for an organization.

Question 3

True or False? A token vault is considered in-scope for PCI DSS.

Answer 3

True

Question 4

True or False? Tokenization eliminates PCI DSS obligations?

Answer 4

False, the vault environment must still meet full PCI DSS controls.

Question 5

What is tokenization?

Answer 5

Tokenization is a security technique that replaces sensitive data (such as a card number) with a non-sensitive, irreversible substitute called a token.

A token has no exploitable mathematical relationship to the original data.

Question 6

How would tokenization work in a payment product? Please map out the steps.

Answer 6

1. Customer enters card number on a secure, PCI-compliant payment form.
2. The payment processor securely sends the PAN to a PCI Level 1 token vault.
3. Vault creates a token.
4. Merchant/platform receives only the token…not the card number.
5. The real PAN stays encrypted in the provider’s vault and never touches the merchant’s systems.

Question 7

What are the various types of tokens?

Answer 7

• Vault tokens (most secure)
• Network tokens (Visa/Mastercard lifecycle tokens)
• Single-use tokens
• Multi-use tokens
• Device tokens (Apple & Google Pay)

Question 8

True or False? Tokenization encrypts the PAN?

Answer 8

False, encryption is a separate process from tokenization.

Question 9

What is network tokenization?

Answer 9

Network tokenization is a type of tokenization performed by the card networks themselves (Visa, Mastercard, Amex, Discover). The PAN is replaced with a card network-issued token than can be used across merchants, devices, and channels with higher security and better authorization rates.

It is different from vault tokenization which is done by processors like Stripe and Adyen.

Question 10

What is account updater and how does it work.

Answer 10

Account updater is a PAN lifecycle management feature for cardholders. It leverages network tokenization to always ensure that your card is available.

If the consumer’s card expires are gets replaced:
- the token continues to work
- the merchant doesn’t need to update stored payment methods
- Reduces churn and dropped subscriptions.

Question 11

True or False? Network tokens are more secure and dynamic the vault tokens.

Answer 11

True, network tokens are used for payment optimization.

Question 12

True or False? Vault tokens reduce the scope of PCI compliance.

Answer 12

True

Question 13

Which entities are more likely to use vault tokens in fintechs?

Answer 13

Payment processors and payment gateways.

Question 14

True or False? Either encryption or tokenization should be used to protect payment data. Both are not needed.

Answer 14

False. Both should be used in security solutions designed to protect data.

Question 15

How does encryption work?

Answer 15

Encryption works by making changes in the type and length of data that renders that information as unreadable in databases and other intermediate systems.

Question 16

What benefit does tokenization have over encryption methods?

Answer 16

• Tokenization is able to be processed by legacy systems.
• Consumes much less computational resources during processing

Question 17

What are the 3 types of tokens in fintech?

Answer 17

• High-value tokens
• Low-value tokens
• Security tokens

Question 18

What is a high-value token (HVT)?

Answer 18

An HVT, is a tokenized representation of a card or bank account that:

• can be used to charge a customer
• Maps back to the real payment instrument (via a secure vault)
• Is reversible by the payment processor
• Has monetary value because it can trigger payments

Since it can move money, it is considered high-value.

Question 19

What is a low-value token (LVT)?

Answer 19

A low-value token is a tokenized identifier that:

• Cannot be decrypted back to the PAN
• Cannot be used to authorize a transaction
• Carries no financial value
• Is safe to store outside the PCI cardholder data environment
• Exist only as a reference ID, customer ID, or metadata object.

Since is cannot perform payment functions, it’s considered low risk and often out of PCI scope.

Question 20

What are the typical uses for a low-value token?

Answer 20

• Customer profiles
• Order history
• Storing which payment method was used (without PAN)
• Linking transactions to CRM records
• Internal analytics

These tasks require referencing a payment method, but not performing payments.

Question 21

What are typical uses for a high-value token?

Answer 21

• Run charges
• Authorize holds
• Process refunds
• Run recurring billing

Question 22

What is a security token?

Answer 22

A security token is a digital credential that proves identity or access rights and is used to authenticate a user or device in a secure system.

Question 23

When would a security token be used?

Answer 23

• One-time password (OTP)
• YubiKey / RSA SecurID
• Authenticator App (TOTP)
• Smart cards
• FIDO2 Keys

Question 24

What is the purpose of a security token?

Answer 24

• Provide strong authentication
• Protect logins with MFA
• Ensure only authorized users access systems.

Question 25

True or False? Tokenization is used for ACH payments to protect account numbers?

Answer 25

True

Question 26

When an authorization request is processed for a payment card, what is returned to the merchant instead of the actual card number

Answer 26

Token

Question 27

What is the central repository for PANs and their tokens in a tokenization system? It is used in the mapping process.

Answer 27

Card Data Vault

Question 28

What is token mapping?

Answer 28

Token mapping is the secure association between a token and the original sensitive data it represents, stored inside a token vault so the token be used for payments without exposing the real card number.

Question 29

In payments, what is a prime target for cybersecurity criminals?

Answer 29

Card Data Vault

Question 30

What is a single-use token in payments?

Answer 30

A single-use token is a temporary, one-time token generated by a payment processor to replace sensitive card data for a single authorization or payment attempt. After the transaction is completed or expired, the token is destroyed or rendered unusable.

Question 31

What is a multi-use token in payments?

Answer 31

A multi-use token is a persistent token generated by a payment processor that: - Can be used for multiple transactions - Supports recurring billing, subscriptions, and stored payment methods. - Maps back to the real card in a PCI Level 1 token vault - Does not expose the card number to the merchant. It remains valid until the merchant or customer remove it.

Question 32

What type of tokenization allows multiple tokens, each used in different domains, to all map back to the same real card in a central token vault?

Answer 32

Cross-domain tokenization

Question 33

True or False? In cross-domain tokenization, each token is isolated to its domain for security?

Answer 33

False. A cross-domain token is a network-generated payment token that replaces the PAN and can be securely used across multiple environments (e-commerce, in-app, mobile wallet, POS) while keeping the card number protected and reducing PCI scope.

Question 34

What is cross-domain tokenization?

Answer 34

Cross-domain tokenization allows a single secure token to be used across multiple domains (such as e-commerce, in-app, mobile wallet, and POS) while the real PAN is stored in a secure vault. This enables interoperable payments without exposing card data.

Question 35

What are 3 potential risky tokenization solutions?

Answer 35

- cross-domain tokenization - token commingling - multiple tokenization solutions

Question 36

tbd

Answer 36

tbd

Question 37

In cross-domain tokenization, what is "bleed-over"?

Answer 37

Bleed-over happens when a token meant for one domain accidentally works in another domain (merchant A's token works in merchant B). A cross-domain token is capable of operating across multiple environments. However, even a cross-domain token is governed by domain controls.

Question 38

What are the risks associated with "bleed-over" in tokenization?

Answer 38

- Fraudulent use of tokens - Unauthorized charges - PCI scope expansion - Loss of domain isolation These issues often happen if domain binding is misconfigured.

Question 39

In cross-domain tokenization, what happens if the token vault is compromised?

Answer 39

- Attackers can obtain or generate high-value tokens - PAN reconstruction becomes possible - All domains are exposed simultaneously - Catastrophic PCI breach Vault security is critical because all tokenized domains converge there.

Question 40

In cross-domain tokenization, what are 3 examples of over-permissioned API Keys?

Answer 40

If a platform or merchant receives permission to: - migrate tokens - retrieve tokens from another domain - perform cross-domain operations

Question 41

In cross-domain tokenization, if over-permissioning of API keys occur, what are risks that will be exposed?

Answer 41

- Tokens may be misused - Unauthorized payments may occur - Fraud risk may elevate - Increased PCI exposure These risks are especially dangerous in embedded payments or marketplace platforms.

Question 42

In cross-domain tokenization, what happens if token lifecycle management is done poorly?

Answer 42

Since cross-domain tokenization can generate many tokens mapping to the same PAN, if tokens are not managed properly: - stale tokens may accumulate - tokens may continue working when they should not - tokens may be used by retired or unauthorized merchants. This expands the attack surface.

Question 43

Regarding cross-domain tokenization, what happens if an embedded payments platform is breached?

Answer 43

- The attacker may gain access to cross-domain payment methods - Tokens may be reassigned or misused. - All merchants under the platform may be at risk. Cross-domain tokenization multiplies the impact of a single breach.

Question 44

What is token commingling?

Answer 44

Occurs when tokens belonging to different merchants, domains, platforms, or use cases become mixed together in the same environment (intentionally or accidentally).

Question 45

How does token commingling create security risks in payments?

Answer 45

Tokens map back to sensitive payment instruments. This creates, security, fraud, governance, and PCI compliance risks.

Question 46

Why is using a multiple tokenization solution a risky endeavor for fintechs?

Answer 46

Tokens come from multiple providers and may have no business logic around which tokens can be used with different service providers. This creates an opportunity for a merchant to use the wrong token to process a transaction.