OpenSSH
"Keeping your communiqués secret"
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| Developer(s) | The OpenBSD Project |
|---|---|
| Initial release | 1 December 1999 |
| Stable release |
7.4 / 19 December 2016
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| Repository | github |
| Development status | Active |
| Written in | C |
| Operating system | Cross-platform |
| Standard(s) | RFC 4250, RFC 4251, RFC 4252, RFC 4253, RFC 4254, RFC 4255, RFC 4256, RFC 4335, RFC 4344, RFC 4345, RFC 4419, RFC 4462, RFC 5656, RFC 6594, RFC 6668, RFC 7479 |
| Type | Remote access |
| License | Simplified BSD, ISC, public domain |
| Website | www |
OpenSSH (also known as OpenBSD Secure Shell) is a suite of security-related network-level utilities based on the Secure Shell (SSH) protocol, which help to secure network communications via the encryption of network traffic over multiple authentication methods and by providing secure tunneling capabilities.
OpenSSH started as a fork of the free SSH program, developed by Tatu Ylönen; later versions of Ylönen's SSH were proprietary software, offered by SSH Communications Security. OpenSSH was first released as part of the OpenBSD operating system in 1999.
OpenSSH is not a single computer program, but rather a suite of programs that serve as alternatives to unencrypted network communication protocols like FTP and rlogin. Active development primarily takes place within the OpenBSD source tree. OpenSSH is integrated into the base system of several other BSD projects, while the portable version is available as a package in other Unix-like systems.
OpenSSH was created by the OpenBSD team as an alternative to the original SSH software by Tatu Ylönen, which is now proprietary software. Although source code is available for the original SSH, various restrictions are imposed on its use and distribution. OpenSSH was created as a fork of Björn Grönvall's OSSH that itself was a fork of Tatu Ylönen's original free SSH 1.2.12 release, which was the last one having a license suitable for forking. The OpenSSH developers claim that their application is more secure than the original, due to their policy of producing clean and audited code and because it is released under the BSD license, the open source license to which the word open in the name refers.
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