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Given that few modern applications would limit a password to only four characters (bank ATMs being a notable exception), passwords can provide somewhat strong protection. Unfortunately, users prefer easy-to-remember passwords that contain familiar or easy-to-type patterns. Predictable patterns greatly reduce password strength. There are password generation tools that attempt to strike a balance between memorability and predictability, by using complex patterns that include a mix of uppercase letters, lowercase letters, numbers, and punctuation. One such tool is the GeodSoft script at http://www.random.org/passwords/, which allows the user to generate random passwords. We believe that passwords such as these are an acceptable compromise between password strength and usability. A truly random series of ASCII characters would be much more secure, but also more likely to be written down or saved in an insecure location. There is one final consideration when it comes to password strength. A highly publicized (but nonscientific) 2004 survey found that 71% of users would be willing to divulge their passwords in exchange for a chocolate bar (see http://news.bbc.co.uk/1/hi/technology/3639679.stm for more information). We generally avoid discussing persuasion, or social engineering, as a security threat, but the reality is that humans are often the weakest link in any secure system.

n this chapter, you ll learn how to build pages that are more interactive than normal HTML pages using a technique called Ajax.

XPath is a language that lets you identify nodes in XML documents. You need XPath expressions to set the select attribute of JSTL XML actions. XPath distinguishes between seven types of nodes: document/root, comment, element, attribute, text, processing instruction, and namespace. For example, take a look at the following XML document: < xml version="1.0" encoding="ISO-8859-1" > <starfleet xmlns:zzz="http://myWeb.com/whatever"> <!-- bla bla --> < myAppl "xyz" > <starship name="USS Enterprise" sn="NCC-1701"> <captain>James (Jim) T. Kirk</captain> </starship> </starfleet> <starfleet> is the document (or root) node, <!-- bla bla --> is a comment node, <captain>...</captain> is an element node, sn="NCC-1701" is an attribute node, the string James (Jim) T. Kirk is a text node, < myAppl "xyz" > is a processing-instruction node, and xmlns:zzz="http://myWeb.com/whatever" is a namespace node.

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Although building effective encryption into an application is extremely difficult to get right, there are, thanks to the efforts of open-minded cryptographers, free software implementations that anyone can use, such as the mcrypt and OpenSSL libraries anyone, that is, not affected by legal restrictions on the import or use of cryptographic software. (Remember that cryptographic algorithms may be viewed as weaponry by the United States government and others; see our summary of this issue at the end of this chapter.) Encryption libraries, like the two mentioned previously, often contain a bewildering array of options and modes, and more than a few different algorithms. Some algorithms may be included for historical reasons, and not because they are useful in any real-world sense. Other included algorithms may be relatively new and insufficiently reviewed by the cryptographic community. In this section, therefore, we

Figure 7 1. Displaying a FAQ Suppose that every question has both a short answer and a long answer. Initially, the short answer is displayed. If the user clicks the question, the answer will change to the long answer. If the user clicks it again, it will change back to the short answer again. To do that, create a new dynamic web project named FAQ in the same way as you have created projects in the rest of the book. As a first step, you ll show a single question only. So, create a listfaq.xhtml page as shown in Listing 7 1.

s Note Processing instructions in an XML document provide information for the application that uses the

advance the notion that the most widely used ciphers are also the best tested and therefore the most resistant to attack, and we concentrate on currently popular algorithms rather than newcomers. We will further limit ourselves to those that are implemented in free libraries and unencumbered by patents. AES, Blowfish, 3DES, RSA, and GnuPG are commonly used and freely available, and all are generally considered safe when used appropriately and with a reasonable key length. All of these ciphers (except GnuPG) are available to PHP programs simply by turning on support for mcrypt (AES, 3DES, Blowfish) or OpenSSL (RSA). They may also be used by calling external programs from within PHP (as we discuss later in this chapter).

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Insert title here</title> </head> <body> <h:form> <h:commandLink action="#{faqService.trigger}" value="#{faqService.questionText}" /> </h:form> <br /> <h:outputText value="#{faqService.answerText}" /> </body> </html>

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