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It s essential that you group your products into categories, especially if you sell a lot of individual ones. In this sample application, we define only one category, but in reality you d need more. As our shop only sells books, our categories refer to broad subjects such as computing, narrative, and science. For each category, we define a name and an identifier that s guaranteed to be unique, so we can refer to each category without ambiguity. For this application, we only need to obtain a category name given its ID. Updating categories would be a task for the administrator role, which, as we said, we won t be supporting.

An encryption algorithm called Blowfish was first proposed by Bruce Schneier in 1994 (see http://www.schneier.com/paper-blowfish-fse.html), and was eventually a finalist in the competition to replace DES. Although it was not chosen by the government, it is generally considered a viable alternative to AES. It has the additional great advantage of having been implemented in open source, so it is neither patented nor licensed. Schneier s own current information about Blowfish is at http://www.schneier.com/blowfish.html. As a result of its availability, Blowfish is widely available as a native routine in many languages. Included among these is an object-oriented PHP implementation called LingoFish (see http://www.killingmoon.com/director/lingofish/intro.php for information). Blowfish is capable of using key lengths in any 8-bit multiples from 32 all the way up to 448. Of course, a key length of at least 128 bits should be considered a realistically secure minimum.

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Change the symbol to IBM, and then submit the form. You should see the messages shown in Listing 2 5. From these messages you can see that a new b1 bean is created. Then for some reason the sym property is read (it is because the UI Input component is checking whether the new value is really different from the old one and, if so, notifying some interested parties). Next, the UI Input component stores IBM into it, and finally it is read again to generate the HTML code.

For each book, we define title, author, price, unique identifier, category ID, and an image of the front cover. Customers must be able to select books from a category, search for books, display the book details, and put books into a shopping cart. Updating book attributes would be an administrator function, which we won t implement in this application.

We include here a brief discussion of the RC4 algorithm, which has become fairly widely used, thanks in part no doubt to its inclusion in the OpenSSL cryptographic library. Because an RC4-encrypted message could be altered in transit without detection (indeed, this is a feature of RC4), it does not meet our standards for cryptographic security, and we therefore do not recommend its use. RC4 was developed in 1987 by Ron Rivest (one of the inventors of the RSA algorithm, discussed in the Asymmetric Algorithms section of this chapter). Its name is officially an acronym for Rivest Cipher #4 but unofficially for Ron s Code #4. It is a proprietary product of RSA Security, Inc., the leading commercial vendor of RSA-based security solutions; see http://www.rsasecurity.com. Its technique, although originally a trade secret, was leaked in 1994, and has since become widely known and widely used. However, since its name is trademarked, the technique is sometimes referred to as ARCFOUR in these unofficial incarnations. A stream cipher, RC4 generates a pseudo-random key and then XORs the target plaintext with it. (We discuss the XOR technique in the Related Algorithms section of this chapter.) RC4 is the encryption technique used with Wired Equivalent Privacy (WEP) and its successor Wi-Fi Protected Access (WPA) for providing (modest at best) protection to wireless networks. It was chosen for this task because it is resistant to noise or transmission errors in the stream. Whereas an error in the transmission of most encrypted messages would turn the decrypted message into gibberish, an error in an RC4 stream affects only a few bytes of the message. Unfortunately, however, this does mean that a

For the moment, when handling the form submission, you re simply letting JSF redisplay the current page containing the form. This is no good. You d like to display a result page showing the stock price instead. To do that, create a stockvalue.xhtml file in the WebContent folder. For the moment, the content is hard coded (see Listing 2 6). Listing 2 6. Result Page

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