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But how should Alice generate s If an attacker can guess s, it does not really matter that Alice had gone through the trouble of encrypting that random number before sending it to Bob. An eavesdropper who can just guess s can decrypt any data that Alice and Bob exchange that is encrypted with s. If the eavesdropper is not simply a passive one, he would also then be able to modify or inject data into Alice and Bob s conversation. Now that we have demonstrated a concrete example in which an inability to generate unpredictably random numbers can result in insecurity, we discuss how we might go about trying to generate random numbers.

We ve covered how to create the widget and how to use it from an MVC application. The one missing piece is distributing the RssWidget portable area.

In Listing 6-1, g_slice_alloc() was used to allocate 100 strings of length SLICE_SIZE. Slice allocation is very simple all you need to do is supply the size of memory that the slice should be. Similar to malloc(), this function returns a gpointer to the memory instead of an object that is cast. Internally, GLib decides whether to use slab allocation or delegate the memory allocation to g_malloc(). Memory allocation is performed by g_malloc() when the desired memory slice is very large. GLib also provides g_slice_alloc0(), which will initialize the returned memory chunk to 0.

This entire component was written in a way that allows it to be compiled down to one file. To use this portable area from an MVC application, the application needs the portable area in its bin directory, so distributing the portable area consists of distributing the DLL. We recommend distributing portable areas in a zip file, and that package should include:

Note Memory slices will choose the most efficient method of memory allocation for the current case during runtime, whether that is slab allocation, g_malloc(), or some other method. However, you can force it to always use g_malloc() by setting the G_SLICE environment variable to always-malloc.

One of the most obvious and trivial ways to generate random numbers using, say, the C programming language, is to use the standard C library function rand(). The rand() function uses a linear congruential generator to generate random numbers. That algorithm generates numbers that, when averaged and examined over time, seem random from a statistical standpoint. However, rand() is not a good function with which to generate numbers that are secure for use with cryptographic algorithms, because after some time, the random numbers generated by rand() repeat in a fairly predictable fashion. Given a handful of numbers output by rand(), you can determine the seed, and all past and future numbers that will be output. Therefore, you should not use rand() to generate random numbers for security applications. The Art of Intrusion, by Kevin Mitnick and W.L. Simon, describes a case in which some rogue programmers used random number prediction to determine what cards video poker machines in casinos would deal, and made off with over a million dollars.

The assembly A readme file that explains what the portable area is intended to do A sample application that shows how to use the portable area

When you are finished using the memory, you should free it with g_slice_free1() so that it can be used by another part of your application. This function frees a memory block of size SLICE_SIZE, located at strings[i]. g_slice_free1 (SLICE_SIZE, strings[i]); Internally, memory will be freed using the same method as it was allocated. Therefore, to use this function, you must have allocated the memory with g_slice_alloc() or g_slice_alloc0(). When you need to allocate only a single instance of an object, g_slice_new() is available. An example of using this function to allocate one object is shown in Listing 6-2. Listing 6-2. Allocating a Single Object typedef struct { GtkWidget *window; GtkWidget *label; } Widgets; Widgets *w = g_slice_new (Widgets); /* Use the structure just as you would any other structure. */ w->window = gtk_window_new (GTK_WINDOW_TOPLEVEL); w->label = gtk_label_new ("I belong to widgets!"); /* Free the block of memory of size "Widgets" so it can be reused. */ g_slice_free (Widgets, w);