Tài liệu tham khảo WikiPedia: OpenSSH http://www.linuxjournal.com/article/4412 http://www.linuxjournal.com/article/4413 http://www.openssh.com/ http://www.openssh.com/portable.html http://www.openssh.com/specs.html http://www.openssh.com/txt/release-7.2 http://www.openbsd.org/cgi-bin/man.cgi?query=ssh http://BXR.SU/OpenBSD/usr.bin/ssh/ https://anongit.mindrot.org/openssh https://www.wikidata.org/wiki/Q847062#P1324
