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This information includes the amount of power that the various circuits are using, and how long the smart card takes to conduct certain computations With this information, the attacker might be able to construct a power attack to extract bits of the key Even with the limitations that smart cards have, they provide a better alternative to storing secrets than source code, files, or the Windows registry While they are not perfect, smart cards do raise the bar of effort required on the part of the attacker to steal stored secrets..

A rule has a condition and action or actions that should be taken when that condition is met The Policy activity allows you to set up a rules-based workflow that can have many conditions, instead of using a series of IfElse activities For more information about the Policy activity, refer to 5 Replicator activity: The Replicator activity is a conditional activity that s similar to the For Each statement The Replicator activity creates a number of instances of a single activity while running All instances must complete before the Replicator activity can complete For more information about the Replicator activity, refer to 5..

Storing Secrets on a Hardware Security Module (HSM)

Figure 6-21. Using a tooltip on a menu And, because flexibility is the name of the game in WPF and because the tooltip is a container, you can implement complex tooltip types by using other controls within the <MenuItem.ToolTip> tag. So, for example, you could put a StackPanel containing an image and a label as shown in Listing 6-15. Listing 6-15. Building a Complex Tooltip in XAML <Menu> <MenuItem Header="CheckStates"> <MenuItem Header="Is Checkable And Is Checked" IsCheckable="True" IsChecked="True"></MenuItem> <MenuItem Header="Is Checkable But Is Not Checked" IsCheckable="True" IsChecked="False"></MenuItem> <MenuItem Header="Is Not Checkable And Is Not Checked" IsCheckable="False" IsChecked="False"></MenuItem>

A hardware security module (HSM) is a device that is dedicated to storing cryptographic secrets. It can be an external device, an add-on card, or a separate machine on its own. HSMs can feature tamper-resistance, but tend to have higher computing power and throughput to support server applications. Some HSMs also have onboard cryptographic accelerators to help speed up cryptographic computations. Keys can be generated on the HSM itself, and if cryptographic operations using them are done only on the HSM, the keys may never have to leave the HSM, which provides for additional security.

When dealing with workflows from other applications, it s important to add fault handling to the workflows to handle any exceptions or faults that might occur. Workflows can have default Fault Handlers defined for various types of exceptions. These Handlers are called any time a specified exception occurs within the workflow. Create a new VB Sequential Workflow Console Application called VBFaultHandlerSequentialConsoleApplication. By default, a FaultHandlersActivity is already created for a new workflow. The FaultHandlersActivity contains only Fault Handler activities. The Fault Handler activity is a composite activity that is, it s made up of other activities. To view and change the FaultHandlersActivity, find the three tabs at the bottom left of the Workflow Designer. The first of the three tabs (from the left) is the View Workflow tab, which allows you to view the workflow model. The second (middle) tab is the Cancel Handler tab. The third tab is the View Faults tab. Click this tab to get to the Faults area to be able to add activities to a FaultHandlersActivity. First, add a Fault Handler activity from the Toolbox to the FaultHandlersActivity that s already within the designer. Open the properties and change the name of this Fault Handler to GeneralFault. Click the ellipse next to the Fault Type property. This opens a window of all types derived from System.Exception, as shown in Figure 7-6.

<MenuItem Header="Is Not Checkable But I Set The IsChecked Property" IsCheckable="False" IsChecked="True"> <MenuItem.ToolTip> <ToolTip> <StackPanel Orientation="Horizontal"> <Image Source="Fishtn.jpg"></Image> <Label>Here is my stackpanel picture tooltip, weird, huh </Label> </StackPanel> </ToolTip> </MenuItem.ToolTip> </MenuItem> </MenuItem> </Menu> You can see the effect of this in Figure 6-22.

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