If your hosting service provider offers shared SSL for securing access to sites, then you can switch on SSL encryption without purchasing your own SSL certificate.
To secure connections to a site by using an SSL certificate shared by your provider:
For example, let us suppose that you have a domain named mydomain.com, the master SSL domain is defined as master_ssl_domain.com, and the virtual directory name you supplied is my_virtual_dir. In this case, to access your site through SSL, you need to use the following address: https://master_ssl_domain.com/my_virtual_dir.
Note: You cannot use your domain name (for example, mydomain.com) to access your site via SSL if you are using shared SSL.