Masking techniques outside code

Question

what are the different masking techniques that can be done outside .net code
Are there any tools available that can be used to mask sensitive data ?
Any thoughts/suggestions will be greatly appreciated

Answer 1

what are your use cases?

in general the server should never send sensitive data to the client (it should only accept). this requires masking at the server.

in databases you can use encryption and access rules to protect.

while not a best practice if you need to round trip security data, then encrypt and store in a hidden field.