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SSH vs. Telnet/Rlogin

Both rlogin and telnet were developed when the internet was still a private government network (ARPAnet) and was only used by government and university researchers in a closed environment. During those days security was not as much an issue as the number of users was controlled and personal computers had not become the standard. In the mainframe world, packet capture and accessing other people's data was not unheard of, but much less common.

Telnet was initially developed in the late 1960s to allow sessions to be established between a user on one mainframe to a different mainframe. Rlogin was introduced in BSD (Berkley Software Distribution) release 4.2 of their open source UNIX in 1983. Again, BSD was released at a time where ARPAnet was still the major network used by universities and research facilities and security was less of a critical issue.


  

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