If you've ever had to encrypt a nationalId , a creditCardNumber , or a medicalRecord field in a Spring Boot entity, you already know the drill. You write an AttributeConverter , you wire up a Cipher instance, you generate an IV, you figure out where the key lives, you get the GCM tag handling wr...
Source: [Dev.to](https://dev.to/clinvio/how-to-implement-field-level-aes-256-gcm-encryption-in-spring-boot-and-why-we-packaged-it-into-one-304d)