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OpenSSH

Not to be confused with OpenSSL.

OpenSSH or OpenBSD Secure Shell
Developer(s)The OpenBSD Project
Initial release1 December 1999 (1999-12-01)
Stable release
9.8[1] Edit this on Wikidata / 1 July 2024
Repositorygithub.com/openssh/openssh-portable
Written inC
Operating systemCross-platform[2]
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[3]
TypeRemote access
LicenseBSD, ISC, public domain
Websiteopenssh.com

OpenSSH (also known as OpenBSD Secure Shell[a]) is a suite of secure networking utilities based on the Secure Shell (SSH) protocol, which provides a secure channel over an unsecured network in a client–server architecture.[4][5]

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.[6] OpenSSH was first released in 1999 and is currently developed as part of the OpenBSD operating system.

OpenSSH is not a single computer program, but rather a suite of programs that serve as alternatives to unencrypted protocols like Telnet and FTP. OpenSSH is integrated into several operating systems, namely Microsoft Windows, macOS and most Linux operating systems,[7][8] while the portable version is available as a package in other systems.[9][10][11]

  1. ^ "release-9.8". 1 July 2024. Retrieved 1 July 2024.
  2. ^ "OpenSSH Portable Release". OpenBSD. Retrieved 15 October 2015.
  3. ^ "Specifications implemented by OpenSSH". The OpenBSD Project. Retrieved 14 October 2015.
  4. ^ Venkatachalam, Girish (April 2007). "The OpenSSH Protocol under the Hood". Linux Journal (156): 74–77 – via the Discovery Database at LSU.
  5. ^ Network Working Group of the IETF, January 2006, RFC 4252, The Secure Shell (SSH) Authentication Protocol.
  6. ^ Cite error: The named reference itworld was invoked but never defined (see the help page).
  7. ^ "dragonfly.git/blob - crypto/openssh/README". gitweb.dragonflybsd.org. Retrieved 19 May 2016. This is the port of OpenBSD's excellent OpenSSH to Linux and other Unices.
  8. ^ "src/crypto/external/bsd/openssh/dist/README - view - 1.4". NetBSD CVS Repositories. Retrieved 19 May 2016.
  9. ^ "openssh". OpenSUSE. Retrieved 17 May 2016.
  10. ^ "Debian -- Details of package openssh-client in jessie". Debian. Retrieved 17 May 2016.
  11. ^ "Arch Linux - openssh 7.2p2-1 (x86_64)". Arch Linux. Retrieved 17 May 2016.


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