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The jsp:useBean action declares a scripting variable and associates a Java object to it It accepts the attributes beanName, class, id, scope, and type, of which only id is mandatory If you type <jsp:useBean id="objName"/>, Tomcat will check whether an object named objName exists in pageContext If it exists, Tomcat will create a variable named objName with the same type as the object, so that you can access the object in subsequent JSP scripting elements If the object doesn t exist, Tomcat will throw a javalangInstantiationException If you type <jsp:useBean id="objName" scope="aScope"/> with aScope set to one of the words page, request, session, or application, Tomcat will behave like we described in the previous paragraph, but it will look for the objName object in the given scope rather than in pageContext You use jsp:useBean not only to access an already created object but also to create it.

$productid = urlencode( $_POST['productid'] );

Then, create a normal navigation rule for the products page as shown in Listing 6 8. Listing 6 8. Navigation Rule for the Products Page

You determine whether a bean is created and what type of variable is made available for JSP scripting via the three remaining attributes: class, type, and beanName If you specify class and set it to a fully qualified class name (ie, with its package, as in javalangString) but specify neither type nor beanName, Tomcat will instantiate in the given scope (in the page context, by default) an object of the given class and create a scripting variable of the same data type named like the value of the id attribute If you also specify type together with class, Tomcat will set the data type of the new object to the value of the type attribute.

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The strength of an encryption or hashing algorithm is commonly expressed by (in the case of encryption) the length of the key, or (in the case of hashing) the length of the digest, for the simple reason that the longer these values are, the longer (in CPU cycles) a brute-force attack will take In our simple encryption example, we used a 16-bit key of 1234 (four 4-bit numbers), which has 2^16 or 65,536 possible values If you tried one guess of the key each second, you could guess every possible value in a little over 18 hours If you had the stamina, you could manage that with a pencil and paper, especially if we assume (as the cryptography community does) that on average a successful attack will take half the time required to exhaust all possibilities A 128-bit key, on the other hand, has any of 2^ 128 possible values.

< xml version="1.0" encoding="UTF-8" > <faces-config ...> <navigation-rule> <from-view-id>*</from-view-id>

You can set the type attribute to the same class as the class attribute (which is equivalent to omitting type), to a superclass of class, or to an interface implemented by class If you specify the beanName attribute instead of class, Tomcat will behave as if you had specified class, but only after attempting to find a serialized bean of that class Serializing a bean means that the object s data is converted to a byte stream and saved in a file with the extension ser Tomcat expects to find serialized objects together with the application classes For example, a serialized bean of the xxxyyyZzz class is expected to be in the WEB-INF\ classes\xxx\yyy\Zzzser file This mechanism lets you save an object in a file and then load it into your JSP page You can actually have several serialized beans of the same class (eg,.

Since 2^128 evaluates to 340,282,366,920,938,463,463,374,607,431,768,211,456, it s not hard to guess that a key of this length would be pretty safe against brute-force guessing But in case you can t quite imagine it, a 10GHz processor (running at 1,000 cycles per second) would take something like 10,790,283,070,800,000,000,000,000,000 years to crunch all the way through every possible combination, assuming that each guess takes one CPU cycle Without a major breakthrough in computing technology (like quantum computing), it will be many years before the processing power to break a 128-bit key by brute force lands on your desktop A hash algorithm that produces a comparably long digest is considered comparably resistant to brute-force attack Weaknesses in cryptographic algorithms can limit the effective key or hash length.

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