If you are interested in learning more about the lower-level details of how SSL works, the following list will help you get started:

http://www.ourshop.com/resources/ssl.html

http://www.askdavetaylor.com/how_does_ssl_work.html

http://www.gcn.com/print/26_18/44727-3.html

http://www.securityfocus.com/infocus/1818

http://www.securityfocus.com/infocus/1820

http://www.wilsonweb.com/wct3/SSLsecurity.cfm