Secure FTP in PI

Hello

we have scenario like: external system --> PI --> Abap backend. FTP is used to transfer files from external system to PI, however the requirement is to make the file transfer secure.

I know PI only support FTP over SSL/TLS, not SSH.

My questions:

1) Fort FTP over SSL/TLS (FTPS), what the basis team needs to do to enable FTPS? (Like what should be deployed or what system configuration needs to be done? any step-by-step instruction?)

2) For SFTP, Michal Krawczyk mentioned in one post to write java proxy to implement SSH. I wonder what Java proxy does that mean? is that adapter module? Has someboday implemented this java proxy? I am very interested to know it, as Michal said it's only couple of days work. (BTW, I am java expert too).

Thank you very much

Jayson