For those unfamiliar with ssh keys, there is a write up about it at: http://sourceforge.net/docman/display_doc.php?docid=761&group_id=1.

To cut to the chase, in order to create a ssh key on your unix machine (or using cygwin with windows), use:

ssh-keygen -t dsa

This will create a few files in ~/.ssh/

~/.ssh/id_dsa.pub needs to be ATTACHED to the issue you create (as described in New Hausmates).

For more details, or how to use other operating systems and clients, follow the link above.