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7 Assume that the length of a key is L bits, and that P is the dollar amount required to pay off the employee to hand over the key to the attacker If you look at security in economic terms, you may want to ask the question: how long does L have to be so that it is not the weakest link The employee may value her job But how much is that job really worth to her Well, she may plan to work at her company for the next Y years, earn a yearly salary of S, and be able to earn an interest rate of For simplicity in doing a back-of-the-envelope calculation, we can assume that she is paid in yearly lump sums, and stores all her earnings in the bank Thus, her job is worth the following:.

Notice that the GtkEntry child of MyIPAddress is not a pointer as with most widgets. This affirms the fact that a derived object is its parent structure in every way. It inherits not only signals, properties, and styles but also the whole object itself. This relationship is reaffirmed by the declaration of a nonpointer GtkEntryClass object in the MyIPAddressClass structure. The MyIPAddress structure does not hold any other objects besides the GtkEntry object. The widget structure GtkEntry was originally used to hold private objects that the programmer was not supposed to access, but GObject provides a better way to implement private properties, which will be covered in the source file. You are also free to place any variables within the widget structure that you deem necessary, although you should consider whether the programmer should have direct access to the objects before doing this. Basically, if the widget needs to react to changes of a variable, it should be declared in the private class in the source file. Otherwise, it can be placed within the public widget structure. In addition to MyIPAddress, you also need to define MyIPAddressClass, which first contains an instance of the parent class type, GtkEntryClass. Again, this should not be a pointer type, because it will allow parent properties, signals, and functions to be inherited by your widget class. Furthermore, you should define callback function prototypes for signals in the widget class. In this example, the ip-changed signal will be added, which will be called when the IP address is successfully changed. This signal is provided so the developer does not need to monitor all four widget properties for changes, since each of the four numbers will be defined as its own widget property.

You ll see a dialog box asking you for some information about the view (shown in figure 1.7). The view name (by default) is the same name as the action, so verify that Index appears in the View name field. You can ignore the other options for now, and click Add.

The last step in creating the header file is to define function prototypes for those functions that are available for the developer to call, as shown in Listing 11-4. We will also define private functions that will only be accessible in the myipaddress.c file. Listing 11-4. Header File Function Prototypes GType my_ip_address_get_type (void) G_GNUC_CONST; GtkWidget* my_ip_address_new (void); gchar* my_ip_address_get_address (MyIPAddress *ipaddress); void my_ip_address_set_address (MyIPAddress *ipaddress, gint address[4]); The four functions in Listing 11-4 will return the GType associated with MyIPAddress, create a new MyIPAddress widget, return the IP address as a string, and provide new IP address values respectively. These will be discussed in more detail later in the chapter when their implementations are covered.

Visual Studio will automatically create the appropriate folder and place the Index.aspx file in it. Open this file and modify it so that it looks like listing 1.5.