At the simplest level, you can think of SSH as a secure replacement for Telnet. It provides virtual terminal services that are encrypted to the user; this includes encrypting the password that the user sends to the server. However, SSH is actually a suite of technologies that provide not only virtual terminal services, but also file transfer and tunneling services that prove extremely useful. In this section, we first discuss the virtual terminal side of SSH and then move onto public/private key use and tunneling data through an SSH secure tunnel.
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