File Encryption

Hi experts,

we have a EDI-Szenario, where we create files to the file-system.

Is there a possibility, to encrypt the files directly after creating the file or durring the creation-process?
So that the file can just be opened with a password?

Or is there a os-script required?
If so, does anybody have an template/link to a script like this?

We are using an linux-system.

Kind regards