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he exercises in this section will help test your understanding and give you some practical experience with the topics covered in s 12 through 15. If you have been reading through all the chapters in this book, and you complete all (or at least most) of the exercises, including the ones listed here, you will be well on your way toward being a security-conscious programmer! 1. Smarti Pants Hellerstein is a software developer who believes he can improve the security of DES by changing how its internals work. Should he do it Provide three reasons why he should or should not implement his ideas in his company s production system that supports 10 million users. 2. List three differences between AES and Triple DES. 3. In Table 16-1, label each of the algorithms as one or more of the following: (a) symmetric encryption algorithm, (b) asymmetric encryption algorithm, (c) hash algorithm, (d) stream cipher, or (e) block cipher. Also specify how many inputs each takes, whether the inputs must be a required size or if they are variable, what number of bits the inputs are expected to be, and what the output number of bits is. Note that we may not have covered all of this information in the text. You are encouraged to consult any security text or the Web to complete the chart. Table 16-1. Taking Stock of Crypto Primitives Exercise

Add the following code to the bottom of the file to create the events that will handle when the workflow is completed and terminated: static void OnWorkflowCompleted(object sender, WorkflowCompletedEventArgs e) { Console.WriteLine("Completed"); } static void OnWorkflowTerminated(object sender, WorkflowTerminatedEventArgs e) { } The code in Program.cs looks like the following: static void Main(string[] args) { WorkflowRuntime workflowRuntime = new WorkflowRuntime(); workflowRuntime.WorkflowCompleted += OnWorkflowCompleted; workflowRuntime.WorkflowTerminated += OnWorkflowTerminated; WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(CFirstSequentialWFConsoleApplication. Workflow1), parameters); instance.Start(); waitHandle.WaitOne(); } static void OnWorkflowCompleted(object sender, WorkflowCompletedEventArgs e) { Console.WriteLine("Completed"); } static void OnWorkflowTerminated(object sender, WorkflowTerminatedEventArgs e) { } Return to the workflow and the designer. View the workflow code and add the following lines to provide the subs to call when each step is executed, as was done in the VB code: private void Step1_ExecuteCode(object sender, EventArgs e) { OutputResult = InputValue1 + InputValue2; Console.WriteLine("Step1"); } private void Step2_ExecuteCode(object sender, EventArgs e) { Console.WriteLine("Step2"); } Debug this workflow, and you ll see Step1, Step2, and Completed within the console window. If you aren t familiar with C#, I recommend A Programmer s Introduction to C# 2.0, Third Edition, by Eric Gunnerson and Nick Wienholt (Apress, 2005). All the code samples in the

The goal of non-repudiation is to ensure undeniability of a transaction by any of the parties involved. A trusted third party, such as Trent, can be used to accomplish this. For example, let us say Alice interacted with Bob at some point, and she does not want Bob to deny that she interacted with him. Alice wants to prove to some trusted third party (i.e., Trent) that she did communicate with Bob. If, for instance, Alice sent a payment for a bill to Bob over the Web, she may want her payment to be non-repudiable. That is, she does not want Bob to be able to deny that he received the payment at some later point for any reason. Alice, for example, may feel comfortable sending money to Trent, but not directly to Bob. Bob also trusts Trent. Trent may say to Bob, Yes, Alice gave me the $500, so you can ship her the goods, and then I will pay you. In such an example, Trent is playing the role of an escrow agent, but trusted third parties may be able to serve in many other types of trusted roles

The XAML API is colossal with too many controls and subcontrols to go into detail on in one chapter. However, it is important to get a good grounding in each of the major controls so you know how to use them and can further explore their APIs. Each control in XAML can have hundreds of properties, events, and methods you can use, and it would take several books to document them all, so this chapter showed you how to use them in your graphical user interface (GUI) applications in a typical manner. You took a tour of all the major control types and built simple applications using them and using their major events. You also looked into the different types of data binding and how you can use them. You looked at how to bind properties of controls to each other so your user interfaces can dynamically update their state based

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