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Communication Security: Web Based Services • Chapter 5  281


                 Figure 5.9 TLS and SSL Settings in IE































                    Unlike SSL, S-HTTP does not require clients to have public key certificates,
                 because it can use symmetric keys to provide private transactions.The symmetric
                 keys are provided in advance using out-of-band communication.



                 EXAM WARNING

                      S-HTTP is easily confused with HTTP/S. Do not make the mistake of con-
                      fusing the two on the Security+ exam. S-HTTP is a security-enhanced ver-
                      sion of HTTP developed and proposed as a standard by EIT. You can find
                      more information in RFC 2660 (www.ietf.org/rfc/rfc2660.txt).





                 Instant Messaging


                 As more and more people go online and more businesses and their employees rely
                 on communicating in real time, IM has grown by leaps and bounds. IM involves
                 using tools such as ICQ,AOL Instant Messenger (AIM),Yahoo! Messenger, Google
                 Talk,Windows Live Messenger (aka MSN Messenger or .NET Messenger), or
                 Windows Messenger that comes with Windows XP.This technology allows you to



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