Editing Secure Shell (section)

==={{Anchor|OSSH}}OpenSSH and OSSH===
In 1999, developers, desiring availability of a free software version, restarted software development from the 1.2.12 release of the original SSH program, which was the last released under an [[open source license]].<ref>[https://marc.info/?l=secure-shell&m=88561413417101 ssh-1.2.13 now available: copying policy changed (permission now required to sell ssh commercially, use is still permitted for any purpose)]</ref> This served as a code base for Björn Grönvall's OSSH software.<ref>[http://www.mirrorservice.org/sites/ftp.wiretapped.net/pub/security/cryptography/apps/ssh/OSSH/ OSSH sources]</ref> Shortly thereafter, [[OpenBSD]] developers [[fork (software development)|fork]]ed Grönvall's code and created [[OpenSSH]], which shipped with Release 2.6 of OpenBSD. From this version, a "portability" branch was formed to port OpenSSH to other operating systems.<ref>{{cite web |url=http://www.openssh.com/history.html |title=OpenSSH: Project History and Credits |date=2004-12-22 |access-date=2014-04-27 |publisher=openssh.com |url-status=live |archive-url=https://web.archive.org/web/20131224105341/http://openssh.com/history.html |archive-date=2013-12-24 }}</ref>

{{As of|2005}}, [[OpenSSH]] was the single most popular SSH implementation, being the default version in a large number of operating system distributions. OSSH meanwhile has become obsolete.<ref>{{cite web|date=2006-02-15|title=OSSH Information for VU#419241|url=https://www.kb.cert.org/vuls/id/MIMG-6L4LBL|url-status=live|archive-url=https://web.archive.org/web/20070927231942/https://www.kb.cert.org/vuls/id/MIMG-6L4LBL|archive-date=2007-09-27|website=CERT Coordination Center|quote=Either way ossh is old and obsolete and I don't recommend its use.}}</ref> OpenSSH continues to be maintained and supports the SSH-2 protocol, having expunged SSH-1 support from the codebase in the OpenSSH 7.6 release.