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HTTP is not a secure protocol Any nosy person who can plug into a network can see and read the HTTP packets moving between a Web server and a Web client Less than nice people can easily create a fake Web site to get people to think it s a legitimate Web site and steal their user names and passwords For an Internet application to be secure it must have authentication (user names and passwords), encryption (stirring up the data so others can t read it), and nonrepudiation (verifying that you are who you really are on both sides of the conversation) While all of 11, Securing TCP/IP, is dedicated to these concepts, we can t mention HTTP without at least touching on its secure counterpart, HTTPS The Web has blossomed into a major economic player, requiring serious security for those who wish to do online transactions (e-commerce) In the early days of e-commerce, people feared that a simple credit card transaction on a less-than-secure Web site could transform their dreams of easy online buying into a nightmare of being robbed blind and ending up living in a refrigerator box I can safely say that it was never as bad as all that And nowadays, there are a number of safeguards on the Internet that can protect your purchases and your anonymity One such safeguard is called Secure Sockets Layer (SSL) SSL is a protocol developed by Netscape for transmitting private documents over the Internet SSL works by using a public key to encrypt sensitive data This encrypted data is sent over an SSL connection, and then decrypted at the receiving end using a private key All the popular Web browsers and Web servers support SSL, and many Web sites use the protocol to obtain confidential user information, such as credit card numbers One way to tell if a site is using SSL is by looking at the Web page address By convention, Web pages that use an SSL connection start with https instead of http HTTPS stands for Hypertext Transfer Protocol over SSL HTTPS uses TCP port 443 You can also look for a small lock icon in the lower-right corner Figure 9-18 shows a typical secure Web page The https: in the address and the lock icon are circled The last few years have seen SSL replaced with the more powerful Transport Layer Security (TLS) Your secure Web page still looks the same as with SSL, so only the folks setting this up really care Just make sure you know that SSL and TLS are functionally the same with Web pages Read 11 for more details on SSL and TLS EXAM TIP HTTP enables you to access the Web, but HTTPS gets you there securely HTTPS uses either SSL or TLS to provide the security.

Summary

If Melissa wants Mike to send encrypted e-mail to her, she must generate her own key pair and send Mike the public key In a typical public-key cryptography setup, everyone has their own private key plus a copy of the public keys for anyone with whom they wish to communicate securely (Figure 11-9)

The rst step is to move the disk to the origin We do this using Z = z z0 = z + 1 i The result is the disk shown in Fig 921 Now we want to transform the disk shown in Fig 921 so that the region of de nition is the entire complex plane minus a hole where the disk was We do this using an inverse transformation: w= The result is shown in Fig 922 1 Z

This chapter introduces many important concepts and applications to make sure your Microsoft/Cisco network stays up and running smoothly and efficiently We examined the benefits of

Figure 11-9

Figure 922 The transformation 1/Z changes the region to the entire complex plane with a hole punched out in the middle The radius of the hole is 1/r if the radius of the disk we started with was Z = rei In our example, r = 2 so the hole here has a radius = 1/ 2

testing a network, along with several different types of tests that you can conduct Network probes and analyzers were introduced, and application testing was demonstrated using one or two analyzers By conducting traffic analysis, you can learn about the utilization on the LAN and WAN links as well as on network devices You learned about network simulations and the many benefits of proactive network testing Conducting simulations is a very important part of lifecycle management for your network Simulations should be carried out often, because today's network experiences many changes to its ever-evolving topological and traffic makeup We walked through the creation of a topological map of your network, using tools to take inventory of all the devices and their device-specific settings discovered using SNMP We found that running the simulation allows you to answer many "what if " questions to help validate the rollout of a new application or hardware The model also helps you plan your capacity for future growth and determine your plan in case of network failures Remember that application testing and network simulation are neither the starting point nor the ending point for your network design questions Because the digital landscape of your network changes constantly, you'll soon learn to appreciate the importance of staying one step ahead of the next big fire

The only problem with all these keys is the chance that someone pretending to be someone else might pass out a public key Thus, there s a strong desire by the recipients to know who is passing out a key This issue falls under the banner of nonrepudiation

Within networking, nonrepudiation simply means that the receiver of information has a very high degree of confidence that the sender of a piece of information truly is who the receiver thinks it should be Nonrepudiation takes place all over a network Is this truly the person who sent in the user name and password to log into my Windows domain Is this really the eBaycom Web site I m entering my credit card number into Did this public key really come from Mike Meyers As a result, nonrepudiation comes in a number of forms, but most of them use a very clever little bit of mathematical magic called a hash