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Given this key and this algorithm, we can encrypt the message hello into icnip, moving the first letter up one and the second down two, and so on. Later, provided we are still in possession of the original key 1234, we can decrypt icnip back into hello, by applying the algorithm in reverse (downup-down-up). Real encryption follows the same general course, although it is naturally far from so simple, and typically involves multiple passes with the addition of random data, so that any shadow of the original plaintext and key are obliterated in the encrypted message. There are two common methods for carrying out encryption. The differences depend on the kind of key being used: 1. Symmetric: In symmetric encryption, both sides share knowledge of the same secret key. This key is used to encrypt a message, and it is the only thing that can decrypt it. (The simple algorithm just illustrated is an example of symmetric encryption; it is easily reversible so long as you know the key.) This kind of encryption is typically fast and effective, but it does require that the two sides share, somehow, one piece of critical information. Common encryption algorithms using such a private key are AES, Blowfish, and 3DES.

%><tr><% for (int kCol = 1; kCol <= nCols; kCol++) { out.print("<td><b>" + resMetaData.getColumnName(kCol) + "</b></td>"); } %></tr><% while (rs.next()) { %><tr><% for (int kCol = 1; kCol <= nCols; kCol++) { out.print("<td>" + rs.getString(kCol) + "</td>"); } %></tr><% } %></table><% conn.close(); %> </body></html> Create the following folder: C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\tests and place in it the jdbc.jsp file. Then start a web browser and type this URL: http://localhost:8080/tests/jdbc.jsp You should see a table with the books in the Eshop database, as shown in Figure A-7.

Figure 6 6. Using a wildcard to match any view ID To implement this idea, modify faces-config.xml as shown in Listing 6 3.

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Asymmetric: In asymmetric encryption, the two sides need not share a common secret. Instead, each side possesses its own specially constructed pair of keys, and the algorithm ensures that a message encrypted with one key may be decrypted only with the other. One of the keys is marked public, and can be published somewhere or sent to anyone who might wish to encrypt a message with it. The other key is marked private, and is kept secret (and often secured using a passphrase so that it can t be snooped off the disk). Each side can now encrypt messages intended for the other side by using the other side s public key, and those messages can be decrypted only by the other side, using its private key. Two common asymmetric algorithms are RSA and what is commonly called Diffie-Hellman but more properly should be called DiffieHellman-Merkle. Asymmetric encryption adds a layer of additional security to any application using it, but along with this additional security comes a layer of complexity in implementation. In addition, asymmetric encryption is computationally intensive, which can be a problem if there is not plenty of computing power to spare.

Figure A-7. The output of jdbc.jsp You still need to install some libraries, but you re basically in business!

Keeping a message private is one thing, but how do we know that the message hasn t been altered (even if it hasn t been read) in transit Cryptographic hashing can be used to perform this function. A hash algorithm generates a unique value from its input, and it is impossible to manipulate that hashed value (or digest) in order to return it back to its original form. Hashing is sometimes called one-way encryption, because even the user who generated the hash cannot get any information back out of it. To give a simple example of hashing, consider the following algorithm: 1. 2. Add up the ASCII values of the characters of the message. Using that added-up value, apply the same alphabetic substitution routine as in the previous example.

< xml version="1.0" encoding="UTF-8" > <faces-config ...> <navigation-rule> <from-view-id>*</from-view-id> <navigation-case> <from-outcome>products</from-outcome> <to-view-id>/products.xhtml</to-view-id> </navigation-case> <navigation-case> <from-outcome>home</from-outcome> <to-view-id>/home.xhtml</to-view-id> </navigation-case> </navigation-rule> </faces-config>

Follow these simple steps to install JSTL: 1. Go to http://jakarta.apache.org/taglibs/doc/standard-doc/intro.html. 2. Scroll down the page until you find Standard-1.1 Taglib News and follow the Apache Jakarta Project Mirrors link of the most recent Standard Taglib version (version 1.1.2 since October 2004).

With this algorithm, the message hello will generate a value of 526 (the total of the ASCII values of the letters hello ) This value is not a key (that is, an independent value being used to manipulate the message), because it is generated out of the message itself Applying the algorithm, the message is transformed into mbnjq (up five, down two, up six, and repeat as necessary) There is no way that we can transform mbnjq back into hello Even if we know the general outlines of the algorithm (alphabetic substitution), we don t know in what pattern that algorithm was applied However, our simple example immediately leaks an important property of the message: its length.

Suppose that each page may need to have a particular header that contains HTML ele ments or even JSF components, as shown in Figure 6 7.

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