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Your application will have a window that is designated as the main window. When your application starts, the first window that is created will become this main window. A reference to this window is available from the Application object by accessing its MainWindow property. This is a read/write property, so you can change your main window should you like by assigning another window to it. Note that it contains a reference to a Window object, so if you want access to methods, events, or properties that may be used for navigation, you ll have to cast it to a NavigationWindow object. Additionally, the Application object has a collection of references to all the open windows in your application. They appear in the order in which they were created. Thus, as you create and close windows, their indexes can change. Although the main window is the first one opened and will typically have the index of 0 under this scheme, this may not always be the case; therefore, if you use the MainWindow property to change, for example, MainWindow to another window, then the Window that was formerly the main window will still have index 0,

his chapter continues our discussion of cryptography by examining asymmetric key cryptography. In the previous chapter, we covered symmetric key cryptography. The problem with symmetric key cryptography is that any two parties that want to exchange confidential information with each other need to agree on a key beforehand. Alice needs to somehow tell Bob the key in order for him to decrypt a message that she sends him. Alice and Bob could meet in person to agree on a key but this is not usually possible in an Internet transaction. How should they agree upon a key For thousands of years, symmetric key cryptography was the only kind of cryptography that existed. In the 1970s, two scientists by the name of Diffie and Hellman came up with a new encryption method called asymmetric key cryptography, also sometimes referred to as public key encryption. Asymmetric key cryptography can help Alice and Bob communicate without having to meet a priori to agree upon a key.

Figure 7-1. CallCreateReview properties Click the ellipse next to the InterfaceType property for this activity. The type selection dialog box appears, as shown in Figure 7-2. Notice the statement Showing interfaces marked with an ExternalDataExchangeAttribute. Only the interfaces that were defined with the ExternalDataExchange attribute are shown in this list. If you didn t add the attribute to the beginning of the interface declaration, you won t see a type listed. If you did add the attribute, you ll see IReview as the only interface defined within the current project in this list. Select IReview, as shown in Figure 7-3, and click OK.

Why do we need asymmetric key cryptography For example, if two people who do not know each other want to communicate privately on the Internet, it would be extremely inconvenient for them to have to meet in person or talk over the phone to agree upon a key Asymmetric key cryptography provides a way for them to do so without having to go to these lengths To illustrate how, we provide an example of a personal dating application in which users do not know each other beforehand, and would like to have private conversations with each other Let us consider a personal dating application with three users: Alice, Bob, and Carol Bob posts a personal ad Bob wants Alice and Carol to be able to send him personal messages, but he wants the contents of those messages to be confidential Bob is a two-timer.

The Image control stores and renders images. It enables you to use the following image types: .bmp, .gif, .ico, .jpg, .png, and .tiff. If the image is a multiframe image such as an animated GIF, only the first frame in the animation is displayed. Multiframe images are not supported in WPF. When you use an image in WPF, the default is that the image area is sized according to the dimensions of the picture. You can override this by setting the width and height using properties.

He wants to respond to Alice and say, I think you are the love of my life, but he s interested in other women as well Carol may also respond to Bob s personal ad, and Bob may not know which woman he loves more He might want to tell both of these women that he loves them, yet he may not want Alice to know that he tells Carol that she is the love of his life, and vice versa We could try to use symmetric key cryptography to enable confidential communication between Alice and Bob, and Carol and Bob If Bob publishes a symmetric key in an online directory, then anyone who has access to that directory has access to that key With the key, someone can decode any messages encrypted with that key regardless of who encrypted it.

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