When you are seriously looking for a managed way of securely transferring files you cannot rely on a number of bash scripts being started by cron. You will need to have a more solid solution. Oracle provides a solution from this in the form of MFT or Oracle Managed File Transfer. I recently wrote a paper on this which can be found on this site. Also a short slidedeck can be found on my slideshare page.
And, if you want a quick a dirty intro with a video, you can find one below.
And, even though I love to create a bash script under Linux and use this for my own systems at home, I have to admit that using a solution like that is not something you really want in a production environment. In case you really need to securely move files in an enterprise environment the MFT solution is something you should look at.