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Secrets can also be stored on a PDA or a cell phone. These two types of devices can be considered together because they exhibit the same characteristics with regard to storing secrets. As opposed to some smart cards, in which users have to enter PINs into an untrusted reader, users may be able to have a higher level of trust in a PDA or cell phone that they own. Cell phones have a direct line of communication with the user, and do not require another device to serve as an intermediary to allow the user to enter his PIN. The keypad on the PDA or cell phone is used instead of the keypad on an untrusted reader. PDAs and cell phones also have more memory to store secrets and faster computational speed than smart cards.

The RAM in PDAs and cell phones, however, is typically not tamper-resistant. If an attacker gets ahold of a cell phone, it is much easier for the attacker to open up the device and access the chip containing the memory for the device. Another disadvantage is that a cell phone or PDA is usually larger than most smart cards. Finally, PDAs and phones are just little computers that can serve as a second factor, but can have bugs and software security vulnerabilities of their own. In addition, communication between such devices and other computers may be awkward but simple using wires. Wireless protocols such as Bluetooth can be used, but secure setup and association can be cumbersome.

The Menu item fires a Click event when it is selected, and you specify this using the Click property. You can then handle the event in your code-behind file with a standard event handler function.

Figure 7-6. Select an exception type. From this list, select the exception that will trigger this Fault Handler. For a general, catch-all exception, select System.Exception from within the mscorlib namespace, as shown in Figure 7-7. Add a Code activity to the GeneralFault Fault Handler activity called GeneralFaultCode. Generate Handlers for this Code activity, and within the ExecuteCode sub add MsgBox("General Fault Error"). Add another Fault Handler activity to the FaultHandersActivity. Call this activity WorkflowTerminatedFault and set the FaultType property to WorkflowTerminatedException from within the System.Workflow.ComponentModel namespace. Add a Code activity to this Fault Handler called TerminatedFault. Generate the Handlers for this Code activity and add MsgBox("Terminated Fault"). Click the first tab on the left at the bottom of the designer to View Workflow. Add a Code activity called FirstActivity and generate Handlers. Within the Handler code add MsgBox("First Activity"): Private Sub FirstActivity_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("First Activity") end Sub

Another device that one could consider using for storing secrets is a key disk. A USB or key disk is a device that can attach into the USB port on a PC. A key disk has a set of non-volatile memory that can be used to store the bits of a secret or key. The key disk s biggest advantage is that it serves as a second factor. The key itself will not be on the user s PC, and will require the user to plug in the second factor, the USB key disk. However, most of these disks don t have a CPU that can run arbitrary programs. The device is not tamper-resistant. If an attacker gets ahold of it, he could simply stick the key disk into his PC and start reading the bits on it. In this case, a user could encrypt the bits on the key disk such that a password could be used to decrypt the data. As with smart cards, key disks have the problem of the untrusted reader. Whatever the user is entering the password into can be used to decrypt the bits on the key disk. The password could be potentially captured, and the key disk may not have good support for authentication.

Here s an example: <Menu> <MenuItem Header="CheckStates"> <MenuItem Header="Is Checkable And Is Checked" IsCheckable="True" IsChecked="True" Name="mnuItem1" Click="mnuItem1_Click"> </MenuItem> </MenuItem> </Menu> The event handler for this will then look like this: private void mnuItem1_Click(object sender, EventArgs e) { string strTest = "Hello"; }

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