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→Secure Communication
== Insecure Communication (Legacy) ==
In the Seneca Computer System Overview, you are shown the use of the telnet application to connect to your Matrix account. When the '''telnet ''' application runs and connects to the server, it acts like a terminal that is physically connected to the computer. In this case, the monitor is the telnet window on your PC, and accepts keyboard entry.
The Telnet application was invented in 1972, and many versions of this applications are still available for many operating systems (eg. Windows, Linux, Unix, Apple-Macintosh). A major weakness of the Telnet is the lack of security. Another individual could easily view or capture a user’s keystrokes when using the telnet application including passwords! Today, Telnet is a legacy application, used rarely or for testing purposes - you should always communicate with servers using encrypted connections.
== Secure Communication ==
'''SSH ''' or “secure shell” application allows data (i.e. keystrokes) to be encrypted to prevent other people intercepting this information. Other than that, the functionality overlaps with telnet. In the Seneca Labs in MS Windows, there is an application on the desktop called SSH Client. You are advised to use this application. You can download or buy SSH applications for your PC at home. On a Unix/Linux host ssh is available on the command line:
<source lang="bash"># ssh username@host for example:
$ ssh user@matrix.senecac.on.ca
</source>