turtlemonvh
commented
4 years ago In addition to FPE, we can also support basic masking (which may be more useful in practice if we're using using this transform before displaying data). See Hashicorp's API design for their "transform" secrets engine here, which includes both of these approaches
This should be considered experimental, but there is a library available, so we can add this as an option:
https://github.com/idealista/format-preserving-encryption-java