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Once the pre-master secret has been determined, the client and server compute some hashes of it that include the random bytes exchanged in the hello messages to arrive at the master secret. DH can also be used for key agreement, but the contents of the ClientKeyExchange will then instead contain parameters similar to those described in Section 14.4.2. Once the master secret is determined, both a symmetric session key and an integrity key are derived from the master secret using a key derivation function specified in the SSL protocol specification. If the server did not possess the appropriate private key, it would not be able to decrypt the pre-master secret, and would not be able to continue communication with the client as all messages including and after the Finished message, are encrypted with a key derived from the pre-master secret. Once the server has been authenticated, the browser typically displays a lock, and the user can be sure he is communicating with the domain name specified in the address bar of the browser.

You ll build this application exclusively using the Expression Interactive Designer. This tool, formerly known as Sparkle, is a new addition to your developer toolbox. It is a fully featured XAML designer that is targeted to professional graphics and user experience designers. It allows them to work in an environment with which they are familiar (instead of using Visual Studio 2005) and allows the developers who implement the application to work in their familiar coding, debugging, and deployment environment. Both use the same project file format and structure, both use XAML to define the user interface, and both can write C# or Visual Basic 2005 code; therefore, the Interactive Designer allows the designer and developer to work closer together than ever before.

The messages exchanged in the mutual authentication case are shown in Figure 15-4. After the ServerHelloDone message is received, the client sends its certificate to the server.

The obvious difference between workflow created in VB and workflow created in C# is that the file that s used to host the console application is called Program.cs instead of Module1.vb. Open Program.cs from the CFirstSequentialWFConsoleApplication project and move the following line of code to the class declaration area (between the class statement and the static void Main statement): AutoResetEvent waitHandle = new AutoResetEvent(false); Next, add Static to the beginning of that line. Remove the same line within static void Main(). Next, change the following lines of code: workflowRuntime.WorkflowCompleted += delegate(object sender, WorkflowCompletedEventArgs e) {waitHandle.Set();}; workflowRuntime.WorkflowTerminated += delegate(object sender, WorkflowTerminatedEventArgs e) Replace these lines with the following: workflowRuntime.WorkflowCompleted += OnWorkflowCompleted; workflowRuntime.WorkflowTerminated += OnWorkflowTerminated; You re removing the preceding lines so you can better define what action to take when the workflow is completed or terminated. Remove the following lines: { Console.WriteLine(e.Exception.Message); waitHandle.Set(); };

Figure 15-4. Mutual authentication in SSL If RSA is to be used for key agreement, the client transmits a ClientKeyExchange message to the server, just as in the server-authenticated-only case, but then sends a CertificateVerify message to the server containing the client s signature on all handshake messages, starting from the ClientHello message up to (but not including) the CertificateVerify message. After the appropriate Certificate, ClientKeyExchange, and CertificateVerify messages are sent by the client as needed, the pre-master secret is set. The master secret is then computed from the pre-master secret, and the client and server transmit the ChangeCipherSpec and Finished messages. Both parties can then start exchanging application data encrypted with the master secret. Much thought has gone into the design of SSL, and its mechanisms prevent a large variety of attacks. For instance, a man-in-the-middle may try splicing in and replaying data from previous sessions in an attempt to take over a conversation, or a malicious client may attempt to coerce a server into using weaker encryption algorithms by claiming it does not support

<Grid> <ListBox ItemsSource="{Binding Source={StaticResource Entries}}" /> </Grid> </Window> As you can see, a DataTemplate is used, and its type is specified as an Entry, which is present in the namespace defined by ent, which of course is the ObservableCollection you built earlier. Within the DataTemplate, a StackPanel is defined, which gives two TextBlock controls, one bound to Name and one bound to EmailAddress. The result of this is visible in Figure 6-30.

newer ones. In addition to defending against such attacks, SSL supports various performance optimizations for example, once a client and server have successfully completed a handshake, they can cache security parameters that they have already negotiated and resume a previous conversation without having to redo a full handshake even if they initiate a new TCP connection. If you require authentication, confidentiality, and/or message integrity between a client and server, you should strongly consider reusing SSL instead of attempting to build a protocol of your own.

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