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We provide a treasure chest analogy to explain how asymmetric cryptography works. If Bob wants people to be able to send him messages secretly, he can ask them to put these messages inside of a treasure chest, and give him the treasure chest. Then he can open the treasure chest. Imagine that Bob can go to some public area such as a park and leave as many open treasure chests as he wants. When people want to send Bob a message, they can put the message into the chest and close it. Anyone is able to lock the treasure chest just by closing it. Bob can come to the park at some point and look at which treasure chests have been locked. Bob has a key that he can use to unlock the treasure chests to retrieve the private messages that people left for him. This basic idea is summarized in the following illustration. In essence, in asymmetric cryptography, when Bob gives out his public key, it is like him giving out an open, empty treasure chest. Anybody can put a message in the treasure chest and lock it by encrypting with Bob s public key. Bob is the only one who can open the treasure chest because his private key is the key to the treasure chest. When Bob does a decryption with his private key, it corresponds to unlocking the chest.

When designing an application, it is important to take into consideration the disabilities that some of your users may have. Therefore, the Accessibility Toolkit (ATK) provides all GTK+ widgets with a built-in method of handling accessibility issues. Some examples of things ATK adds support for are screen readers and high-contrast visual themes for people who are visually impaired and keyboard behavior modifiers, such as sticky keys, for those with diminished motor control. Although this is an important part of designing an application for production use, this book will not cover ATK. You need to learn how to use GTK+ widgets and how to create your own custom widgets before you can use ATK. Therefore, I will focus on GTK+ and other essentials for the remainder of this book. It is important that you keep accessibility in the back of your mind and revisit the library when you are ready to deal with ATK in your own applications.

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GTK+, in its original form, can be used with the C programming language, but bindings have been created for many others. The most popular language bindings are in the following list, although a full list is available at www.gtk.org/bindings.html: Gtkmm is the official set of C++ bindings. You can use GTK+ with C++ because of backward compatibility, but Gtkmm provides all of the GTK+ features in a series of classes, the style of which will be familiar to all C++ programmers. The sources for Gtkmm, GLibmm, Libglademm, and other dependencies are available at www.gtkmm.org. PyGTK, available at www.pygtk.org, provides Python bindings for the GTK+ libraries. The advantage of using PyGTK is that it takes care of memory management and type casting for you. This alleviates problems that can plague programmers using other language bindings. Gtk2-perl, available at http://gtk2-perl.sf.net, provides all of the GTK+ libraries in an object-oriented Perl toolkit. Each of the libraries is split into modules called Glib, Gtk2, and Gtk2::GladeXML. Like most GTK+ bindings for scripting languages, memory management is handled by the language s facilities. PHP-GTK allows for handling PHP language bindings for GTK+. The PHP bindings allow you to create client-side cross-platform GUI applications. PHP-GTK is available at http://gtk.php.net. This topic is also covered in the Apress book Pro PHP-GTK, authored by Scott Mattocks (Berkeley, 2006). Java-Gnome, much like Gtkmm, provides a true object-oriented platform for the GTK+ libraries. Available at http://java-gnome.sf.net, it provides all of the essential libraries for developing GTK+ applications in Java. Gtk# provides GTK+ bindings for C# applications on a wide variety of operating systems. It is provided by the Mono Project at www.mono-project.com.

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