Domain validation is the simplest method of issuing an SSL certificate. With this type of
validation, the CA (certificate authority) sends an activation link to the email address held exclusively
by the owner of the domain in question (e.g. webmaster@domainname-tld). The owner of the domain can then
agree to the issuing of a certificate by using the activation link.
A considerably more secure option is organisation validation. Here, the CA verifies the existence
of the certificate owner. This certificate therefore confirms the identity of your company - not merely
the validity of your domain. Your customers can click on the seal or lock shown in their browser to check
that they have not been the victims of a phishing scam.
Extended validation is currently the most secure type of validation offered. Such certificates are
issued by the CA only after conducting stringent background checks. The reward for passing such a check is
the green address bar shown in the user's browser. This clearly visible colour change assures your
customers that you are extremely serious about the security of their data. EV-based certificates are used
by businesses such as banks that require the transfer of highly confidential information.