Advances, Systems and Applications
Table 5 Tokenization techniques for obscuring bank customers data records
Techniques | Description | Customer name | Date of birth | Street | City | Phone number | Account number | Account balance |
|---|---|---|---|---|---|---|---|---|
Sample data | ||||||||
Alice | 17.12.1973 | Side hill | Downtown | 0418-444-4467 | 6207693489 | $5000 | ||
Bob | 24.09.1990 | North | Brooklyn | 0418-444-6423 | 3001337388 | $10000 | ||
Permutation | - Maps each data field value to a distinct new value. - Using secure enclave we can translate new value to original value. | Eva | 17.12.1973 | Side hill | Downtown | 0418-444-4467 | 6207693489 | $5000 |
Rob | 24.09.1990 | North | Brooklyn | 0418-444-6423 | 3001337388 | $10000 | ||
Customer name data field values mapped to a distinct new values. | ||||||||
Prefix-Preserving | - Retains the birth year on date of birth or Replace with a dummy date. - Useful for preserving date field format. | Alice | 07.02.1973 | Side hill | Downtown | 0418-444-4467 | 6207693489 | $5000 |
Bob | 14.04.1990 | North | Brooklyn | 0418-444-6423 | 3001337388 | $10000 | ||
The birth year will be preserved, but the date of birth is scrambled. | ||||||||
Hashing | - Maps different data field values to a new single value. - Useful for translating large amount data values to a new value. | Alice | 17.12.1973 | 8704274623 | 0418-444-4467 | 6207693489 | $5000 | |
Bob | 24.09.1990 | 7909231657 | 0418-444-6423 | 3001337388 | $10000 | |||
Each customer street and city is mapped to a unique new value. | ||||||||
Truncation (or) Non-disclosure | - Data field values to be shortened by truncating end values. - Useful for tokenizing fields. | Alice | 17.12.1973 | Side hill | Downtown | 0418 | 6207693489 | $5000 |
Bob | 24.09.1990 | North | Brooklyn | 0418 | 3001337388 | $10000 | ||
The phone number is shortened, but still preserves the customer location. | ||||||||
Hiding | - Replaces sensitive value with a character (typically x) or constant value ‘0’. - Useful for preventing sensitive data fields. | Alice | 17.12.1973 | Side hill | Downtown | 0418-444-4467 | xxxxxx3489 | $5000 |
Bob | 24.09.1990 | North | Brooklyn | 0418-444-6423 | xxxxxx7388 | $10000 | ||
Except last four digits of an account number, all other digits will be substituted with a character ‘x’. | ||||||||
Shift | - A data field value is added to a fixed offset. - Useful for obscuring data field, while allowing authorized users to perform computation in cloud. | Alice | 17.12.1973 | Side hill | Downtown | 0418-444-4467 | 6207693489 | $15000 |
Bob | 24.09.1990 | North | Brooklyn | 0418-444-6423 | 3001337388 | $20000 | ||
A fixed offset $10000 is added to the account balance values. | ||||||||