Ssh

SSH stands for "Secure Shell" and was first written by a Finnish computer scientist named Tatu Ylonen. Mr. Ylonen went on to found SSH Communications which continous developing the ssh program. The program uses both symmetric and assymetric cryptography in order to keep the OSI session layer secure from session hijacking and sniffing.

The OpenSSH Fork

OpenSSH was forked from a free version of SSH 1.2.12 and shipped with the OpenBSD 2.6 system. It has gained popularity among many vendors and is shipped with their products as well. Tatu Ylonen's company took OpenSSH to court but lost.