FTPS with PL/SQL

Doing a FTP-job with PL/SQL is not difficult.
A basic implementation of RFC 959 can be written in a few hundred lines. See for instance ORACLE-BASE, How to FTP with Oracle PL/SQL or Oracle FAQ’s
But what if you want to secure your FTP transmission. Google doesn’t find any PL/SQL solutions, only java solutions with a PL/SQL wrapper.
Securing FTP transmission can be done in two ways: SFTP and FTPS.
SFTP stands for SSH (more...)