Left and Right Settings
The Left and Right Settings property indicates the number of characters from left and right that will remain in the clear and are excluded from format preserving encryption.
Starting from v10.0.x, the new FPE data elements created with the Left and Right settings cannot be deployed to the previous versions of protectors.
It is recommended not to use the Left and Right settings for the FPE token as these settings are not present in the version of FPE that has been approved by NIST. If you use the Left and Right settings, then it reduces the strength of the FPE token.
A maximum of 99 characters can be retained in clear with the left and right setting. These characters are used to generate the tweak.
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