secure ftp protocol

[gertsy]

You can try if you get sftp in one of these working:
http://amiga.sourceforge.net/?showpackage=OpenSSH

I suggest you get yourself some linux or bsd system to use as "hop host" between your Amiga and the Internet, where you can install ftp server, telnet, rsh etc service for your legacy systems, and from there use secure modern protocols.

+1.  Inelegant but easiest.