I need to secure some of the subdomains of my domain name

A Wildcard SSL Certificate is the best choice for you. Wildcard certificates secure domain names along with all subdomains. For example, a Wildcard certificate issued for *.mydomain.com may be used to secure all the following host names:

  • mydomain.com
  • www.mydomain.com
  • login.mydomain.com
  • secure.mydomain.com
  • support.mydomain.com
  • etc.
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