Moodle SSL Certificate and HTTPS

To avoid session hijacking in your Moodle site you will need to activate https in the entire site. Please look at the next links in order to learn more...

• Moodle community thread dealing with entirely Moodle site with SSL?
• Moodle SSL Certificate (Secure Sockets Layer) and HTTPS 

I found the two links above specially helpful. Also, you might want to have a look to the next link in general recommendations for Moodle security

• General Security recommendations