Network Security \ Charlie Kaufman, Radia Perlman, Mike Speciner.
   More information about the book
Applied Cryptography \ Bruce Schneier.
   More information about the book
Network and Internetwork Security \ William Stallings.
   More information about the book
 

SSL and security related topics on the web:

http://www.homeport.org/~adam/ssl.html - An overview of SSL version 2.
http://home.netscape.com/eng/ssl3/ssl-toc.html - The SSL Protocol version 3.0, internet draft.
http://developer.netscape.com/docs/manuals/security/sslin/contents.htm - Introduction to SSL.
http://colossus.net/SSL.html - The SSL protocol.
http://www.faqs.org/rfcs/rfc2246.html - The TLS Protocol version 1.0.
http://www.itl.nist.gov/fipspubs/fip180-1.htm - Secure Hash Standard.
http://www.faqs.org/rfcs/rfc1321.html - MD5.
 

Sources of free pictures that were used in this web site:

http://www.1clipart.com
http://www.tau.ac.il/images/Images.html