View source for Secure Shell

{{IPstack}}
{{redirect|SSH|the file transfer protocol|SSH file transfer protocol}}
'''Secure Shell''' ('''SSH''') is an [[Internet]] [[communication protocol]] used mostly to allow users to log into other computers and run commands. It lets people exchange data using a [[secure channel]] between two [[computer]]s. It is used mainly on [[Linux]], [[Apple Macintosh|Macintosh]] and [[Unix]] computers. It is a lot like [[Telnet]], but is safer. It is less likely to be hacked than [[Telnet]] is. 

A person can make a key out of numbers. This key has two parts, a private part that should not be shared and a public part that should be. These parts are mathematically related to each. To send a message to a computer, the message is [[Encryption|encrypted]] with the sender's private key and the receiver's public key. This is done in such a way that the message can only be read if the receiver has their private key and the sender's public key. This means that an attacker cannot read the messages without both keys.  

SSH was designed by [[Tatu Ylönen]] in 1995 to replace the less secure protocols [[rlogin]], [[Telnet]] and [[rsh]], which were used to access [[shell account]]s on remote computers.

== Secure Shell Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:X11 ssh tunnelling.png|Example of tunneling an [[X11]] application over SSH: the user 'josh' has "SSHed" from the local machine 'foofighter' to the remote machine 'tengwar' to run [[xeyes]].

File:OpenWrtPuTTY.png|Logging into [[OpenWrt]] via SSH using [[PuTTY]] running on [[Microsoft Windows|Windows]].

File:Ssh binary packet alt.svg|Diagram of the SSH-2 binary packet.
</gallery>
== Related pages ==
* [[Internet protocol suite]]
* [[Communications protocol]]
== Other websites ==
{{wikibooks|Internet Technologies/SSH}}
* [http://www.chiark.greenend.org.uk/~sgtatham/putty/ Putty] - SSH on Windows


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[[Category:Internet security]]
[[Category:Computer protocols]]