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1. 2.

This is the classic risk to an authentication system. If Henry s goal is masquerade, he s simply trying to convince the system that he is in fact someone else, perhaps Cathy, since the system already knows how to recognize her. Henry proceeds by trying to trick the system into accepting him as being the other person. Once the masquerade has succeeded, Henry can take advantage of the situation in various ways. For example, if Henry gets himself authenticated as Cathy, he might help himself to any particular abilities Cathy might have in the computing system, such as access to confidential files, sensitive applications, or

4:

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Using one of the servlet examples in this chapter that accepts a POST request, experiment with sending a POST request using a telnet client. Hint: you need to set the content-length header. In the section on Using the response Object, we very briefly outline the basic steps for using a servlet to send binary data to a client. Create a servlet that accepts a request from a client for an image file. The name of the image file can be passed as a form parameter, part of the URL, or as extra path information. Write the servlet to load the named image into a byte array, set the content type for an image, set the content length (the number of bytes in the array), and write the image to the response. In the session tracking example, remove the code that performs the URL rewriting, set your browser to reject cookies, and experiment with the example to see how it behaves in this situation. Expand the session tracking example to write a cookie with the user ID to the client browser. Use this cookie to recognize the user and initialize some session data. If you have read the JSP chapters, rewrite the final example to use custom actions in the JSP pages.

The Session Initiation Protocol (SIP)

First, notice that MyThread is passed a ManualResetEvent in its constructor. When MyThread s Run( ) method finishes, it calls Set( ) on that event object, which puts the event object into a signaled state. Inside Main( ), a ManualResetEvent called evtObj is created with an initially unsignaled state. Then, a MyThread instance is created and passed evtObj. Next, the main thread waits on the event object. Because the initial state of evtObj is not signaled, this causes the main thread to wait until the instance of MyThread calls Set( ), which puts evtObj into a signaled state. This allows the main thread to run again. Then the event is reset and the process is repeated for the second thread. Without the use of the event object, all threads would have run simultaneously and their output would have been jumbled. To verify this, try commenting out the call to WaitOne( ) inside Main( ). In the preceding program, if an AutoResetEvent object rather than a ManualResetEvent object were used, then the call to Reset( ) in Main( ) would not be necessary. The reason is that the event is automatically set to a non-signaled state when a thread waiting on the event is resumed. To try this, simply change all references to ManualResetEvent to AutoResetEvent and remove the calls to Reset( ). This version will execute the same as before.

4. 5.

Notice that in classic form, more than one parameter can be in a list after the type name. This isn t allowed in the modern form. In general, to convert the old-style form into the modern (C++ style) form, simply move the parameter declarations inside the function s parentheses. Remember, each parameter must be declared separately, each with its own type specifier.

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The Creation of C#

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