英語 English：Secure shell
日語 Japanese：ＳＳＨ (エスエスエイチ)
類義 Synonym：SSH protocol SSH client Remote access
意味 Meaning：SSH (Secure SHell) is a technology that allows computers to operate each other through a network in a client-server model. In simple words, SSH is computer remote control.
SSH is used for remote login and file transfer. In effect, it allows you to control the other person's computer. Therefore, to prevent unauthorized access, SSH comes with security management, authentication, and encrypted communication functions.
The most common use of SSH is in server administration. Engineers access the server computer from a client computer at home via SSH to solve server problems.
解説 Commentary：SSH is technically a combination of the SSH protocol and the SSH client.
The SSH protocol is a standard and corresponds to the transport layer of the OSI model.
The SSH client is software for remote control and corresponds to the application layer of the OSI model.
In the development stage, SSH uses port number 22 by default.
ＳＳＨの歴史 History of SSH：
The motivation for the development of SSH was the weak security (or vulnerability, as it is called in the computer industry) of earlier remote control technologies.
Prior to the development of SSH, remote control technology existed. While convenient, they did not completely eliminate unauthorized access.
Therefore, SSH was developed in 1995 to prevent it from becoming a hotbed of crime.
ＳＳＨクライアントまとめ List of SSH client：
| Date | English | Japanese |
|---|---|---|
| 1999 | OpenSSH | オープンエスエスエイチ |
| 1999 | PuTTY | プッティー |
| 2004 | Tera Term | テラターム |