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When two computers on different networks are communicating, they are often sending packets across multiple routers, allowing traffic to be susceptible to a variety of security holes at each stop along the way. Even with good inspection on a firewall, an attacker can still perpetrate a man-in-the-middle attack, or an attack where someone spoofs a trusted host while sitting between your server and a user accessing your server. A man-in-themiddle attack is designed to intercept all the traffic between two points, either in order to eavesdrop, or to insert malicious traffic. To keep prying eyes off your data, it is important to implement encryption techniques on your communications, rendering the data unreadable to the interceptor. If your data are passing from your home to your office, for example, you would implement a VPN. If you are taking customer data over web sites, then you might consider using SSL. We discuss using VPN and SSL further in 15.

To make this discussion concrete, consider a control that implements a simple button. You can use the control from C# inside the Visual Studio designer like the native button, as shown in Figure 11-4.

Hubs are dummy devices that connect multiple computers, making them act as a single segment on a network. With hubs, only one device can successfully transmit data at a time. When two computers submit data at the same time, a collision occurs, and a jam signal is sent to all the ports when collisions are detected. This makes one computer able to cause collisions and force an entire network to slow down while packets that were jammed are re-sent by all the computers that attempted to communicate during

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Figure 11-4. The F# button control used in a C# application and the Visual Studio designer You start your control by inheriting from the UserControl class:2 open open open open System System.Drawing System.Windows.Forms System.ComponentModel

Mint.com is Intuit s free, online personal finance software. The official Mint.com app (Figure 14 15) is also free and gives you access to your personal finances, including a widget. You can choose whether the phone remembers your data or requires a password each time you log in. Just make the appropriate choices in the app s Settings menu by pressing the Menu button. Remember, if you choose to install the Mint.com widget portion, you re exposing your financial data to anyone within eyesight.

the jam Hubs will also allow any computer to see the packets sent by all other computers on the hub Switches are more advanced than hubs and provide expandability, allowing more switches, ports, and computers to exist on a network Switches perform collision detection and isolate traffic between the source of a packet and its destination Because each computer is not automatically able to see all the traffic from other computers, this is a more secure communications environment Switches are less likely to become flooded with collisions and offer faster throughput and lower latency We advise against the use of hubs as a general rule, unless you have a very explicit reason to use them, because they can act as potential collision centers and cause security breaches However, hubs do still have limited usefulness in networks Switches respond to loops, hubs do not.

type OwnerDrawButton() = inherit UserControl() You then define the state of the control in terms of the class s fields: let mutable text = "" let mutable pressed = false

The text field contains the button s label As you did for the movingPoint variable in the Curves example, the pressed field is responsible for remembering whether the button is currently pressed, allowing the paint handler to behave appropriately You override the OnPaint method to handle the paint event You allocate the pens and the brush required to draw and invert the role of the border colors in order to achieve the raised effect when the button isn t pressed and the depressed look otherwise You also measure the size of the label string, because you re interested in drawing the string in the center of the button You can then draw the lines on the borders, playing with colors to obtain a 3D effect The pens and brushes are disposed at the end of the function: override xOnPaint (e:PaintEventArgs) = let g = e.

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