WS_FTP, CuteFTP and unkerberized Fetch (versions 3.03 and below) do not encrypt your password when sending it across the network. MIT Information Systems considers this an unacceptable security risk. This series of pages describes how to securely move files between your local computer [Mac and PC] and Athena. They are focused on moving HTML documents, but can be used for any type of file.
FileZilla (see the MIT Release Notebook)
Plop: Using Kerberized Plop to Upload Files from Your Windows NT or 2000 Computer
Secure File Transfer using Dreamweaver for Windows
Using Kerberized Fetch to Securely Transfer Files to and from Athena
Secure file transfer on the Mac using Better Telnet
Here's a list with the pointers to the software and information you may need
to install in order to transfer files securely.
Comments to webhelp@mit.edu