42.1. Introduction to SSH
SSH is a protocol for securely logging into and transferring files to and from a UNIX system over a network. All SSH traffic is encrypted so that anyone listening in on the network cannot capture passwords, which is a vast improvement over the insecure telnet and FTP protocols. In a way, SSH can be thought of as a secure replacement for those protocols, although in fact it can be used for much more.
An SSH server is a daemon process that runs on a UNIX system waiting for connections. An SSH client is a program run by a user (or from a script) that connects to a server to start a remote login session or transfer some files. Both the client and server authenticate themselves to each other, so that each can be sure of the ...
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