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33Save Time By Keeping your private bitsprivate Using a secure GUIacross a network Using public-key authen- tication for remote login Using scpto copy files Forwarding ports tosecurely breach a firewall TechniqueSecuring YourConnections with SSHIn the good old days, if you wanted to log in to a remote computer, yousimply ran telnet. The telnet program would reach across a networkand give you a remote command line. When you typed a commandinto the telnet client, the characters that you typed were sent blissfullyover the wire, and the telnet server on the other end would execute thecommand and send the results back to you. Were we really so young then? With the advent of the Internet, new villains appeared, eager to grab ourpasswords and credit card numbers as they leapt from ISP to ISP. Theproblem with telnet is that everything that you type is sent across the net- work in the clear. Anyone watching the bits stream across the networkcan see your private bits. The solution to this problem is SSH. SSH, which is an acronym for secure shell,encrypts your data as it travelsacross a network so that passwords, financial data, and private e-mail arenever exposed to any hacker who can intercept them. An SSH connectionconsists of two parts: a server and a client. An SSH server waits patientlyon a host computer, listening on a specific port for a client to log in. Whenan SSH client connects to a server, the two programs begin a lengthynegotiating session that results in a fully encrypted connection. SSH provides a remote command line. With SSH, you can start graphicalprograms that run on the server but display their data on your local computer. SSH also provides port forwarding. With port forwarding, you can tunnelthrough firewalls to gain access to machines on the other side. Forwardeddata is protected traveling back and forth to the protected host, while theserver remains secure behind its firewall. In this technique, we introduce you to the benefits of using an SSH client. SSH provides a secure connection across a local network or over the Inter- net, through firewalls, and with great speed, and it merges with your desk- top environment via a quick link. We show you how to use your SSH client(which comes complimentary with Fedora) to do all of these things.
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