OK

On the home machine add to /etc/ssh/ssh_config:
Protocol 2
PasswordAuthentication no
ChallengeResponseAuthentication no
AllowUsers yourusernamehere

This limits logins only to your username and prevents password authentication.

On you work machine run ssh-keygen -t dsa
From your work machine copy ~/.ssh/id_dsa.pub to your home machine /home/yourusernamehere/athorized_keys

Make sure that after the copy it is chmod 600

From work issue ssh [email protected]ine and you should connect.

Connections will be then limited to only the work machine.

If you want to make it more secure I think you can add passphrases when you ssh-keygen - man ssh-keygen for help.

Steve