SSL (Secure Sockets Layer) security certificates become necessary when you start doing payments using credit cards. It is a common requirement of banks if you cooperate with some of them, to provide payments with credit cards.
We can divide SSL certificates into two large categories according to the use of certificates:
Identity certificates—the objective of these certificates is to inform whether the visitor whose address was typed into the input is on the web page.
Encryption certificates—these protect the data between two computers (for example, between the online shop and visitor) so that all the data are confidential.
Also, TYPO3 users sometimes use SSL certificates for administrative side (backend) protection. This is possible using a web page provider's free SSL. Such certificates can be created using the open source solution OpenSSL.
But these certificates based on OpenSSL can be untrustworthy for web page visitors, because the certificate developer could...