If a Nobel prize equivalent existed for software developers to recognize their immense contribution to the field, Tatu Ylonen would deserve it for sure. It's great to know stories like this one.
The real reason for SSH being an immense contribution is that the OpenSSH fork happened when Tatu Ylönen made the original SSH program proprietary. Now that I think of it, I wish they had renamed it to something without "SSH" in the name, so he and the SSH Company couldn’t keep reaping name recognition benefits.