You can use MindTerm SSH to connect to X.dialup.mit.edu securely, if your browser includes Java support (please use this page instead if you are using Netscape on a Macintosh.) You should use Netscape version 4.06 or higher for best results.
Please see the Athena Dialup page for more information about other software you can use to connect securely to the Athena dialup servers.
Questions or comments can be sent to bug-dialup@mit.edu.