Explanation
"This encryption method is reversible, which helps to maintain referential integrity across your database and has no character-set limitations."https://cloud.google.com/blog/products/identity-security/take-charge-of-your-data-how-tokenization
https://cloud.google.com/dlp/docs/pseudonymization
FPE provides fewer security guarantees compared to other deterministic encryption methods such as AES-SIV. For these reasons, Google strongly recommends using deterministic encryption with AES-SIV instead of FPE for all security sensitive use cases. Other methods like deterministic encryption using AES-SIV provide these stronger security guarantees and are recommended for tokenization use cases unless length and character set preservation are strict requirements-for example, for backward compatibility with a legacy data system.