Is there any way to secure the data through the os bottom encryption? that
is to say in localhost reading and writing, encryption is transparent and
declassification, once you try to copy to other computers, it is encrypted
and need to be decrypted for read. is there a way to do it?

TCFS developed by Italy team seems to be the one, but normally it's used
with NFS and used to ensure the data secure transfers between NFS server and
client, Who have tried it and would you please give some advice? Thanks for
your help!

Have a good day!