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People are becoming more and more concerned about the security and privacy of electronic communications, particularly wireless When a wireless system is compromised, the intrusion is not detected until harm has been done to the system or to its subscribers

Figure 8-9

Wireless versus Wired Wireless eavesdropping differs from conventional wiretapping in two fundamental ways First, eavesdropping is easier to do in wireless systems than in hard-wired systems Those old-fashioned hardwired phone sets might not always be convenient, but your privacy is more likely to be maintained than in the case with a system that uses any form of wireless Second, eavesdropping of a wireless link is nigh impossible to physically detect, but a tap can usually be found in a hard-wired system If any portion of a communications link is done by wireless, then an eavesdropping receiver can be positioned within range of the RF transmitting antenna (Fig 32-6) and the signals intercepted The existence of a wireless tap has no effect on the electronic characteristics of any equipment in the system Levels of Security There are four levels of telecommunications security, ranging from zero (no security) to the most secure connections technology allows No Security (Level 0): In a communications system with level 0 security, anyone can eavesdrop on a connection at any time, provided they are willing to spend the money and time to obtain the necessary equipment Two examples of level 0 links are amateur radio and citizens band (CB) voice communications Wire Equivalent Security (Level 1): An end-to-end hard-wired connection requires considerable effort to tap, and sensitive detection apparatus can usually reveal the existence of any wiretap A communications system with level 1 security must have certain characteristics in order to be effective and practical:

As you know, you can configure your page with data downloaded using Ajax And you can even write new HTML to the page to add controls as needed for example, you might be downloading house listings from a real estate site, and need to create buttons so the user can e-mail the listing agent Creating new HTML is a very common thing to do in Ajax, and as you ve seen, you can create that new HTML just by writing it to the page On the other hand, if you have a lot of HTML to write, it can get confusing There is a special dynamic HTML method, createElement, you can use to create new HTML elements, saving you time if you have to create a lot of new elements createElement has the added benefit of working in both Internet Explorer and Firefox-type browsers

8:

The cost must be affordable The system must be reasonably safe for transactions such as credit-card purchases When network usage is heavy, the degree of privacy afforded to each subscriber should not decrease, relative to the case when network usage is light

Ajax applications frequently need to create new HTML elements For example, if you download data for a Rolodex-like phone directory, you ll have to create the HTML for the controls used in the Rolodex Or if you write an Ajax e-mail application that downloads e-mail text before the user asks for it, to avoid delays, you ll have to create buttons and text fields to enable the user to answer their e-mail Or if you re interacting with an online database, you ll have to create an HTML table on-the-fly to display that data in All these tasks can be performed with the createElement method, and we ll take a look at that method in a new example, createElementhtml, now When you click a button in this example, the example creates a text field with text in it, a working button (clicking it will display a JavaScript alert dialog box), and some text How can we create just text It turns out that we can create text nodes with a method named createTextNode, and that s what we ll do, adding the text we want to display to that text node We start the createElementhtml example with the button the user clicks to create the new elements: