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I've been using SSH for years as my primary administrative access to all my servers:
The secure shell, ssh, is a replacement for telnet, rlogin, and rsh. In contrasts to these latter programs ssh encrypts everything that is sent over the network. This is particularly importaant with respect to passwords that can be "sniffed" when sent in clear-text over the internet. Similarly, the secure copy, scp, is a replacement for ftp and rcp. Scp also encrypts all data that are transferred over the network.
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