I want to totally secure my data exchange that is taking place on my site.
You need to have a SSL certificate associated with your website. SSL (Secure Sockets Layer protocol) is a standard for transmitting confidential data such as credit card numbers over the Internet. Most true business sites support this feature which allows more security in data transmitted over the web. SSL uses a private key to encrypt data that is transferred over the SSL connection.
You need to make sure, that you get dedicated IP, as the SSL requires dedicated IP, as name-based hosting does not support data encryption in HTTP requests.
The H-Sphere control panel allows you to use certificate you already have or create a temporary certificate and then acquire a permanent certificate from a trusted authority. You can use Shared SSL certificate instead of purchasing a certificate of your own.
If it is allowed in your plan, you can also buy and install a permanent Comodo Certificate directly from your CP.
Later you can renew permanent certificates.