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height of the font into account. The width of a given text for most fonts depends on the text because characters widths differ.

To extend the notation first described in Section 12.1.2 for asymmetric cryptography, we introduce two keys: kp and ks, which are the public and private (or secret) keys, respectively. An encryption function takes a message and the public key as input to produce ciphertext: F(m,kp) = c. The decryption function takes the ciphertext and private key as input, and produces the plaintext: F 1(c,ks) = m. An asymmetric cipher, then, is an encryption and decryption function for which F 1(F(m,kp),ks) = m. The cipher is asymmetric because different keys are used for encryption and decryption.

Because Routes was originally ported from the Ruby on Rails version, a few features have been added that in hindsight aren t necessary and are best to disable. In the following sections, you ll look at these features, what they do, and how to disable them.

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Listing 7-9. The constructor and the sizeHint method of the button MyButton::MyButton( QWidget *parent ) : QAbstractButton( parent ) { } QSize MyButton::sizeHint() const { return QSize( fontMetrics().width( text() )+10, fontMetrics().height()+10 ); } The task of painting the button is taken care of in the paintEvent method (see Listing 7-10). The method starts with the creation of a QPainter object for painting to the widget. All widgets are double-buffered by Qt, so when you draw to the painter, you are actually drawing to a buffer that is used to redraw the screen. This means that you do not have to worry about flickering. There are two ways to draw widgets: directly or through a style. By using a style, you can adapt the widget s look to the rest of the system. By drawing directly to the widget, you get full control. For the button you will draw the frame and background using a style and the text directly.

It is highly likely that all these features will be completely removed in a future release of Routes.

After briefly discussing how symmetric ciphers worked in 12, we provided some examples of them, such as DES and AES Now that you have learned how asymmetric ciphers work in general, we give two examples of them; namely, RSA and ECC RSA was the first asymmetric encryption algorithm ever published Shortly after Diffie and Hellman published a paper about the idea of an asymmetric cipher, Rivest, Shamir, and Adelman (the R, S, and A, in RSA) came up with a concrete algorithm that was able to serve as an asymmetric encryption scheme RSA is the most widely known and used asymmetric cipher It is used in a variety of different protocols in the world of computer security, including SSL, CDPD,1 and PGP 2 RSA has been used in many different applications to date, and is likely to be used in many different applications in the future.

Each widget has a QStyle associated with it that you can reach through the style property. This style usually reflects the system s setting, but it might have been changed from the code instantiating widget. The widget itself should not care about the origin of the style or its relation to the current platform. Before you can use the style for drawing, you need to set up a style option object (in this case, a QStyleOptionButton object). The style option class to use depends on the style element to draw. By referring to the Qt documentation for the drawControl method, you can see which style object it expects. The style option object is initialized by passing the this pointer to its init method, which configures most of the settings. However, you still need to tell whether the button is being pressed or is toggled. These states are available from the isDown and isChecked methods implemented by the QAbstractButton class. If the isDown method returns true, the button is currently being pressed. If isChecked returns true, the button has been toggled and is currently checked (that is, in its on state). When the button is being pressed, set the QStyle::State_ Sunken bit in the style option s state property. For checked buttons, the QStyle::State_On bit is set.

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