Apple MAC people + Linux
create an ssh key using MAC or Linux platforms
open a terminal and enter the command
"ssh-keygen". Accept all default filenames.
Choose a passphrase when asked for one. Then email the sys admins the file
.ssh/id_rsa.pub
Directories starting with a . are normally not visible, so it might be easiest to first copy that file into your home directory:
cp ~/.ssh/id_rsa.pub