– Sample video from the Security+ SY0-401 Cert Guide 3rd Edition. Gives a basic introduction to PKI and SSL certificates used in websites. [iframe width=”640″ height=”360″ src=”http://www.youtube.com/embed/WVoimbaTgEw?vq=hd720″ frameborder=”3″ allowfullscreen]   The Security+ SY0-401 Authorized Cert Guide is available at Amazon.