You can use the NZservers secure certificate or you can apply for your own secure certificate.

How to access NZservers secure certificate

https://secure.nzservers.com/~username/

Example:-

you want to use FormMail.cgi under a secure server

https://secure.nzservers.com/~username/cgi_bin/FormMail.cgi

Link to Thwate http://www.thawte.com/ for more information about secure certificates