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case, the CA publishes a certificate revocation list (CRL) that specifies all of the keys that are revoked, or should not be trusted. Principals that need to encrypt data with public keys or verify digital signatures are expected to check CRLs for revoked keys as part of their processing. The CA, together with all of the corresponding hardware, software, services, and processes required to support public key encryption, decryption, digital signatures, and certificates, are often referred to as public key infrastructure (PKI).

This example simply prints a message and displays the converted data structure..

Listing 7-13. The class declaration of the custom widget class CircleWidget : public QWidget { Q_OBJECT public: CircleWidget( QWidget *parent=0 ); QSize sizeHint() const; private slots: void timeout(); protected: void paintEvent( QPaintEvent* ); void mousePressEvent( QMouseEvent* ); void mouseMoveEvent( QMouseEvent* ); void mouseReleaseEvent( QMouseEvent* ); private: int x, y, r; QColor color;

Figure 6-6. The repeating fields example in action If you were to add some valid data, the result would be structured as shown here (although I ve added some whitespace for clarity): { 'person': [ {'surname': u'Gardner', 'role': u'2', 'firstname': u'James', 'title': u'Mr'} ], 'start_date': datetime.date(2008, 5, 23), 'end_date': datetime.date(2012, 2, 3), 'title': u'Cancer Trial 3449' }

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int mx, my; QTimer timer; }; The constructor shown in Listing 7-14 initializes the radius of the current circle, r, to 0, meaning no circle. It then configures and connects a QTimer object. The timer interval is set to 50 milliseconds, meaning that the circle will be updated roughly 20 times per second (this is often enough to imitate a continuous motion). Listing 7-14. Initializing the custom widget CircleWidget::CircleWidget( QWidget *parent ) : QWidget( parent ) { r = 0; timer.setInterval( 50 ); connect( &timer, SIGNAL(timeout()), this, SLOT(timeout()) ); } The sizeHint method is the simplest one of the entire class; it simply returns a static size (see Listing 7-15). Listing 7-15. Returning a static size QSize CircleWidget::sizeHint() const { return QSize( 200, 200 ); } Listing 7-16 shows the three methods used to track the mouse activity. Before looking too closely at the methods it is important to know that mouse movements are reported only when the mouse buttons are pressed. This means that mouseMoveEvent will not be called unless a mouse button is pressed.

13.6. Identity-Based Encryption (IBE)

Summary

Both mousePressEvent and mouseMoveEvent update the mx and my variables according to the coordinates passed in the QMouseEvent object. They are used by the timeout slot when determining whether it wants to grow or shrink the current circle. The timeout slot is connected to the timer, so you can turn the timeout slot on and off by starting and stopping the timer in the mousePressEvent and mouseReleaseEvent. The timer will be active only when a mouse button is being pressed (during that time, the mx and my values are valid).

Form handling can be a complex area, but in this chapter you learned the key principles involved in creating HTML forms, populating fields, validating complex data structures, and displaying error messages. By dealing with these processes individually, Pylons gives you the flexibility to create any sorts of forms your application needs. In 15, you ll revisit forms and see how you can use Ajax to make certain aspects of form handling slicker.

In the RSA and ECC schemes described previously, Alice would need to acquire Bob s public key certificate before sending an encrypted message to him (or else she could not be sure that she would be encrypting with Bob s public key, and not that of an impostor) Alice would either have to request Bob s public key certificate from Bob, from a directory, or from the CA Part of the reason for the existence of the public key certificate is that in both RSA and ECC, Bob s public key, kp, is a string of bytes that happens to satisfy the constraint F 1(F(m,kp),ks) = m, and the certificate binds kp to Bob s identity However, if Bob s public key could instead be, say, his e-mail address (bob@learnsecurity com), then Alice would not have to fetch Bob s public key certificate if she knows his e-mail address.

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