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In this subsection, we review some relevant points originally made in 2 regarding security by obscurity. Note that the design of the DES and Triple DES algorithms are completely public. They are specified in FIPS 46-3. Their security, however, is not dependent upon the secrecy of the algorithm it is dependent upon the keys provided as input to the algorithm. If an attacker determines a key, you can simply change it to thwart further eavesdropping or attack. Unless there is some mathematical property of the algorithms that the attacker can exploit, her only option is brute-force search for the correct key. Moreover, every additional bit used in the key doubles the number of keys that the attacker needs to try to find the correct one. Therefore, if you use a long enough key, it would take the attacker too much time to attack the algorithm via brute-force search. The attacker s best option may be to attack the algorithm based on its mathematical properties. The hope, however, is that it is very hard to defeat the mathematical properties of the algorithm. Cryptographers have put much effort into the design of encryption algorithms such as Triple DES and AES. You probably should not try to invent your own encryption algorithm with the hopes of doing better. At the same time, we do not discourage innovation. If you have an idea about how to do encryption better, have read cryptography literature, and have designed your own encryption algorithm, you should share that algorithm with other cryptographers and give them the opportunity to crack it before considering using it in a real system that users depend on. Make your algorithm public, just as other cryptographers have, to ensure that the security of the algorithm you are developing is not based on its obscurity.

In Listing 5-1, specifying GTK_DIALOG_MODAL created a modal dialog. It is not necessary to specify a title or parent window; the values can be set to NULL. However, you should always set the title, so it can be drawn in the window manager. Otherwise, the user will have difficulties choosing the desired window. Lastly, a NULL-terminated list of action area buttons and their response identifiers should be specified. In Listing 5-1, an OK button with a response of GTK_RESPONSE_OK was added to the dialog. Alternatively, you can create an empty dialog with gtk_dialog_new(), but in that case, you will need to manually add buttons with gtk_dialog_add_button() or gtk_dialog_add_buttons(). In most cases, it is easier to create dialogs in the same manner as shown in Listing 5-1. By default, all dialogs place a horizontal separator between the main content and the action area of the dialog. However, in some cases, as shown in this example, it is desirable to hide the separator. This can be done with gtk_dialog_set_has_separator(). void gtk_dialog_set_has_separator (GtkDialog *dialog, gboolean has_separator); After the child widgets are created, they need to be added to the dialog. As I previously stated, child widgets are added to the dialog by calling gtk_box_pack_start_defaults() or gtk_box_pack_start(). The dialog has a public member called vbox into which child widgets are packed as follows: gtk_box_pack_start_defaults (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox); gtk_widget_show_all (dialog); At this point, you need to show the dialog and its child widgets, because gtk_dialog_run() will only call gtk_widget_show() on the dialog itself. To do this, call gtk_widget_show_all() on the dialog or its GtkVBox. If you do not show the widgets, only the separator and action area will be visible when gtk_dialog_run() is called.

RouteTable.Routes.Add("ProductsRoute", new Route ( "products/apparel", new CustomRouteHandler("~/Products/ProductsByCategory.aspx", "category=18") ));

G_TYPE_NONE G_TYPE_CHAR G_TYPE_INT G_TYPE_LONG G_TYPE_BOOLEAN G_TYPE_ENUM G_TYPE_FLAGS G_TYPE_FLOAT

The custom route handler simply needs to build the page. Listing 16.15 shows a barebones handler that will work.

The ciphers covered thus far in this chapter are called block ciphers because they take input blocks of 64, 128, 192, or 256 bits at a time. However, we have not talked about how to encrypt more data than a couple hundred bits at a time. For example, suppose we have a 1-MB document of plaintext that we would like to encrypt with a 64-bit key using DES (1 MB is 16,384 64-bit blocks). We could take each of these 64-bit blocks of plaintext input and independently run each of them through DES to produce 16,384 64-bit blocks of ciphertext. This technique is called Electronic Code Book (ECB) mode encryption. It is conceptually equivalent to looking up each 64-bit plaintext block in a large electronic code book to determine what the corresponding ciphertext block should be. The problem with ECB is that it is likely that some of the 64-bit plaintext blocks are repeated many times in the 1-MB document. For instance, if the document is made up of text, and the word security appears frequently in the document aligned on 64-bit boundaries, then the ciphertext corresponding to security will appear in the encrypted document just as frequently. ECB leaks information about the structure of the document to the attacker.