Using secure services to talk to other hosts

• Don't send information in cleartext over the 'net! People can ``sniff'' usernames, passwords, other important info out of network traffic
• Use secure mail protocols if possible (S/IMAP, or perhaps tunnel cleartext POP connection using SSH) (S/IMAP at PPPL?)
• Don't telnet, ftp, rcp! Replace with ssh, sftp, scp!
• OpenSSH is a free implementation of SSH for almost all UNIX platforms (http://www.openssh.com). (Might be appearing on the PPPL Unix cluster soon?)
• SSH tools are available for Windows and Mac also (look at http://www.openssh.com/windows.html for a list of free Windows and Mac clients)
• If all else fails, use the java ssh client at https://w3.pppl.gov/ssh (must authenticate).
• Better to use SSH with private/public key pairs (rather than password authentication). Try not to use .shosts!
• I'll cover: (a) How to install and configure openssh (b) how to create and use ssh key pairs (c) how to run an ssh server with ipchains firewalling