History of the Protocol

The Secure Shell protocol has seen steady improvement and increased adoption since 1995. The first version of Secure Shell (SSH1) was designed to replace the non-secure UNIX "r-commands" (rlogin, rsh, and rcp). Secure Shell version 2 (SSH2), submitted as an Internet Engineering Task Force (IETF) draft in 1997, addresses some of the more serious vulnerabilities in SSH1 and also provides an improved file transfer solution.

This increasing popularity has been fueled by the broader availability of commercially developed and supported client and server applications for Windows, UNIX and other platforms and by the efforts of the OpenSSH project to develop an open source implementation.

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