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The function returns a pointer to the outer rectangle, which in turn contains the other two. This means that the pointer can be used to manipulate all the shapes. Listing 7-20. A shape containing two other shapes QGraphicsItem *createItem( int x, QGraphicsScene *scene ) { QGraphicsRectItem *rectItem = new QGraphicsRectItem( QRect( x+40, 40, 120, 120 ), 0, scene ); rectItem->setPen( QPen(Qt::black) ); rectItem->setBrush( Qt::gray ); QGraphicsRectItem *innerRectItem = new QGraphicsRectItem( QRect( x+50, 50, 45, 100 ), rectItem, scene ); innerRectItem->setPen( QPen(Qt::black) ); innerRectItem->setBrush( Qt::white ); QGraphicsEllipseItem *ellipseItem = new QGraphicsEllipseItem( QRect( x+105, 50, 45, 100 ), rectItem, scene ); ellipseItem->setPen( QPen(Qt::black) ); ellipseItem->setBrush( Qt::white ); return rectItem; } The createItem function is used in the main function shown in Listing 7-21, in which a scene is created. Five items are then added to that scene before it is shown. Each of the items is transformed in a different manner. The resulting scene can be seen in Figure 7-29. Refer to the figure and the source code when you look at the transformations applied on each of these items.

psycopg2 http://initd.org/projects/ psycopg2 MySQLdb module packaged as mysql-python http://sourceforge.net/projects/ mysql-python pysqlite http://initd.org/tracker/pysqlite cx_Oracle http://www.python.net/crew/ atuining/cx_Oracle/ pyodbc (recommended), adodbapi, or pymssql http://pyodbc.sourceforge.net/ kinterbasdb http://kinterbasdb. sourceforge.net/ informixdb http://informixdb.sourceforge. net/

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Figure 13-1. Authentication with encryption The challenge message contains a nonce (some random number) in it. In Figure 13-1, Alice encrypted the number 384764342 with Bob s public key and sent the nonce to Bob. Bob can use his private key to decrypt the message to retrieve the plain text 384764342, and send it back to Alice. Since Bob is the only person who can decrypt this message with his private key, Alice can be satisfied that she is communicating with Bob if he can respond with the nonce that she encrypted with his public key. An impostor such as Mallory would not possess Bob s private key and would not be able to decrypt the challenge. Obviously, Alice should send a different, unpredictable nonce each time, or else Mallory may be able to replay a message that Bob previously decrypted to impersonate him. In this example, we have used public key encryption to achieve authentication. Encryption can also be used to implement digital signatures and message integrity, among other things. In 15, we show how encryption can be used to implement digital signature schemes and message authentication codes.

Figure 7-29. From the left: original, rotated, scaled, sheared, and all at once The item1 item is placed in the scene without any transformations being applied. It can be seen as the reference item. The item2 item is translated, rotated 30 degrees, and then translated back to its original position so that the rotation is made around the (0,0) point. By translating the item so its center point is in the point (0,0), you can rotate it about its center before putting it back in its original position by translating it back.

SQLite http://sqlite.org Oracle http://www.oracle.com/technology/ products/database/oracle10g/index.html Microsoft SQL Server http://microsoft.com/sql/ default.aspx Firebird http://www.firebirdsql.org/ Informix http://www.ibm.com/software/data/ informix/

If you are just looking to get started quickly, SQLite is a good choice. You can download the latest SQLite 3 binary for your platform from http://www.sqlite.org/download.html. Once you have installed it, you will be able to run the sqlite3 command to get an interactive prompt: $ sqlite3 SQLite version 3.4.0 Enter ".help" for instructions sqlite> You can type .help for help or .quit to quit. I ll use SQLite for the examples because it is so easy to set up, but you could equally well use any of the systems in Table 7-1. SQLite also has the advantage that the Python modules it needs are already included with Python 2.5 and newer.

The item3 item is also translated so that the point (0,0) becomes the center of the item. It is scaled before it is translated back because the scaling is also relative to the coordinate system s center point. By scaling the item around its center, you change the size of the shape, but not its position. The fourth item, item4, is translated and retranslated as both item2 and item3. Between the translations it is sheared. The fifth item, item5, is scaled, rotated, and sheared, which makes it distorted. This item shows how to apply all transformations to one object.

n this chapter, we focus on keys how they can be generated, stored, and used in different ways, and how parties can agree upon them. Key management refers to the process by which keys are generated, stored, agreed upon, and revoked. The following list presents some important questions pertaining to key management. Generation: How should new keys be created Storage: Once created, how should keys be securely stored so that they cannot be easily stolen Agreement: How should two or more parties decide on a session key used to protect the confidentiality of their conversation

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