Secure Shell (Secure Shell) or the abbreviation ssh SSH) is an internet protocol that allows the exchange of information with the use of a secure channel between two devices connected in the network creates. Both the original version of this protocol it is called, SSH1 or SSH1 and SSH2 or SSH-2 be known. At first, on systems with the basic Unix and Linux, to access to the accounts of shell usage. SS for Tel net, and other skins of telecommunications non-secure created.