FFX schemes for Format-Preserving Encryption

Within tokenization we can apply format preserving encryption (FPE) methods, which will convert our data into a format which still looks valid, but which cannot be mapped to the original value. For example, we could hide Bob’s credit card detail into another valid credit card number, and which would not reveal his real number. A tokenization server could then convert the real credit card number into a format which still looked valid. For this we have a key which takes the data, and then converts it into a form which the same length as the original.