Java Security

Hi,

I've been trying to figure out how to develop a way, so that by using a browser-based GUI, I can allow users to upload and download files to and from an ftp server in a secure manner. I'm also concerned about sending user account information to logon to the ftp server in an unsecured manner. And another consideration is to figure out a way to do this without asking users to have to download a proprietary client or something of the sort. So I guess it would have to be done through an applet. Also, I'd like to keep the files encrypted on the ftp server which is sitting out in the DMZ. And then decrypt them later when i pull the files into the internal network. Also, if there are files on the ftp server to be downloaded, those will have to be encrypted too. So, when the user downloads them, the applet or webpage will have to figure out a way to decrypt it on their machine. I've been researching this problem for a couple of weeks, and haven't been able to come up with a complete solution as yet.

I would appreciate any ideas you might have, or if you could point me in the right direction.

Thanks.