SSH superseded Telnet, but nothing replaced email yet.

SSH superseded Telnet

What is Telnet? 

Telnet is a protocol for remote cli access to devices and servers that was first designed in 1969. Telnet is an acronym for teletype network and it can also be used as a verb.

Telnet was mostly used to test and troubleshoot remote servers, chat on BBSes, play MUDs, and operate on secure internal networks.
 

Why SSH over Telnet

Telnet experienced some issues. Because it was not encrypted, it was subjected to sniffing attacks. Tatu Ylönen created SSH in 1995 at Helsinki University of Technology to prevent such attacks. SSH-1, the initial version of SSH, was created to replace insecure protocols like rsh, rlogin, and telnet. It started out as shareware, but eventually evolved into proprietary software.

Once SSH-1 became widely used, the IETF formed a group to design a successor for it. It was first published in 2006 and was called SSH-2. It wasn't just an enhanced version of SSH-1, but a complete redesign of the original protocol to address the faults of its predecessor.

Most servers nowadays enable ssh access, and permitting telnet access is considered a poor security practice.
  

Email is still the king

Start of email 

Email was invented in 1965 at MIT as part of a software called "MAILBOX." They could use that program to leave messages for other users on the same computer, which were displayed to the user the next time they logged on. The program was very effective at leaving mail for others, but it was limited to the same computer.

Creation of ARPANET

ARPANET (Advanced Research Projects Agency Network) was created in 1969. It was an experimental computer network funded by the US Defense Department. On October 29th, 1969, the first computer-to-computer message was sent using it.

Email using ARPANET

In 1971 Ray Tomlinson used the ARPANET's networked email technology to develop an electronic mail system. As the system grew in popularity, an issue arose. How to indicate where the message was supposed to be delivered to? The "@" symbol was proposed by Ray Tomlinson and it simplified destination addressing to "username@name of computer."

By 1976, electronic mail accounted for 75% of ARPANet's traffic. The protocol is still very popular and there have been discussions about replacing it for years, but no promising contestants have shown up yet.
 

Sources

https://www.extrahop.com/resources/protocols/telnet/

https://www.pcmag.com/news/7-modern-bbses-worth-calling-today

https://phoenixnap.com/kb/what-is-ssh

https://www.techtarget.com/searchsecurity/tip/An-introduction-to-SSH2

https://www.britannica.com/topic/ARPANET


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