You can enable Secure Sockets Layer (SSL) for websites and wikis to make them more secure.
When you enable SSL for websites, it enables SSL for all web apps, such as wikis. The URLs for your websites and wikis start with https instead of http. If you go to the http URL for your website, you’re redirected to the https version. Also, SSL websites use port 443, while non-SSL-encrypted websites use port 80.
For instructions, see Use an SSL certificate.