Tokenization vs. Encryption
Tokenization and encryption both protect sensitive data, but they solve different problems. Encryption transforms data into unreadable ciphertext that can be reversed with the right key. Tokenization replaces sensitive data with a non-sensitive token and stores the original value separately in a secure vault.
In payments, this distinction matters because cardholder data, PCI data, and personally identifiable information need different controls depending on whether the business is storing, transmitting, reusing, or exchanging the data with another provider.
What Is Tokenization?
Tokenization replaces sensitive data with a token that has no useful value on its own. For example, a card number can be stored in a vault while the merchant keeps only a token for future payments, subscriptions, or card-on-file transactions.
What Is Sensitive Data?
Sensitive data is information that can identify a person, expose a financial account, or create risk if it is leaked. In payments, this includes cardholder data such as PAN, expiration date, CVV, and related PCI data. It can also include PII such as names, addresses, phone numbers, and other customer identifiers.
What Is Encryption?
Encryption encodes sensitive data using an algorithm and key. The encrypted value can be decrypted later by a system that has the proper key. Encryption is useful when data must be transmitted or stored securely while still remaining recoverable.
Practical Difference Between Encryption and Tokenization
| Encryption | Tokenization |
|---|---|
| Mathematically transforms readable text into a secret or disguised way of writing text using an encryption algorithm and key | Randomly generates a token value for readable text and stores the mapping in a database |
| Managed to large data volumes with just the use of a small encryption key to decrypt data | Hard to scale securely and maintain performance as database increases in size |
| Used for structured fields, as well as unstructured data such as entire files | Used for structured data fields such as payment card or Social Security numbers |
| Perfect for exchanging sensitive data with third party partners and vendors who have the encryption key | Not simple to exchange data since it requires direct access to a token vault mapping token values |
| Format-preserving encryption schemes come with a tradeoff of lower strength | Format can be maintained without any diminished strength of the security |
| The initial data leaves the organization, but in encrypted form | The initial data never leaves the organization, satisfying certain compliance requirements |