Tatu Ylönen

b. 1968, Finland · Original author of the SSH protocol and the first SSH implementation

Also known as: Ylönen

Tatu Ylönen designed the SSH (Secure Shell) protocol in 1995 while a researcher at Helsinki University of Technology. The original SSH implementation later became proprietary, prompting the OpenBSD project to write OpenSSH in 1999 — the version now shipped on virtually every Linux distribution. SSH replaced telnet, rlogin, and rsh on every Linux system.