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How does format-preserving encryption work?
30 August,2022 by Rambler
The Encryption algorithm , Format Preserving Encryption (FPE) maintains the format of the data. For example , if you had a credit card with 16 digits - 01234567890123456 - acting as the input to the block cipher , then same format would be preserved at the output - 7890123456789012.
The ability to maintain the data format has benefits for data modelling. The data model is able to preserve the same data model structure i.e length and format. There is no requirement to adjust length to support other formats such as hexadecimal or base-64 types.
When FPE is applied it is possible to keep working with the existing database without any structural changes and if properly managed not making any functional changes to the database.
| Credit Card Number | Telephone Number | |
| Input | 6789 1234 4567 | 897-234-4567 |
| Output | 8976 2476 0987 | 234-890-3456 |
Some other benefits in using FPE are :
1) Simplified infrastructure. FPE is normally applied as a service and the encryption\decryption\masking operations are applied through HTTP API calls.
2) Data no longer tokenized. The encryption process retains the input data format.
For more in depth information on Format-preserving encryption check this link
Author: Rambler (http://www.dba-ninja.com)
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