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file that contains the public key and additional information such as the name of the certificate holder, the expiry date, and so on. Certificates can be distributed to anyone, and anyone can verify if they belong to the right person. How do we verify that Along with the public key and the information about the certificate holder, certificates carry a signature a checksum encrypted with the certificate authority s private key. Anyone can obtain the public key for the CA; in fact, the keys for the most popular authorities are already available with any Windows installation. Using a public key, anyone can verify a certificate s integrity. Back to our problem: Mike buys a digital identity from a certificate authority, and we start again. He calculates a checksum for the script and uses his private key to encrypt it. He then sends the script, the encrypted checksum, and his certificate (containing his public key). Upon receiving his message, we use the certificate authority s public key to verify if Mike s certificate is authentic. If it is, we extract Mike s public key from the certificate and use it to decrypt the script checksum. Now, we can calculate the checksum ourselves and compare our value to the decrypted one. If the two are equal, we are safe running the script. This approach cannot be broken, because an attacker will not have the CA private key and he cannot issue a fake certificate. CAs take all the extra care and responsibility for preventing anyone from getting hold of their private keys.

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The Deserialize method of WorkflowMarkupSerializer is passed the DesignerSerializationManager instance along with an XmlReader that provides access to the markup file. The result of the deserialization is an object derived from the base Activity class. If there are any errors during deserialization, the Errors property of the DesignerSerializationManager provides access to the collection of errors. /// <summary> /// Modify the workflow definition in code /// </summary> /// <param name="workflow"></param> private static void ModifyWorkflow(Activity workflow) { //locate the activity to change WriteMessageActivity wmActivity = workflow.GetActivityByName("writeMessagePositive") as WriteMessageActivity; if (wmActivity != null) { //change the message wmActivity.Message = "This is a revised message"; } } In the ModifyWorkflow method, a simple change is made to the workflow model. The writeMessagePositive activity is retrieved by name, and the value of the Message property is changed. /// <summary> /// Serialize a workflow to markup (xaml) /// </summary> /// <param name="workflow"></param> /// <param name="fileName"></param> private static void SerializeToMarkup( Activity workflow, String fileName) { try { using (XmlWriter xmlWriter = XmlWriter.Create(fileName)) { WorkflowMarkupSerializer markupSerializer = new WorkflowMarkupSerializer(); markupSerializer.Serialize(xmlWriter, workflow); } } catch (Exception e) { Console.WriteLine("Exception during serialization: {0}", e.Message); } } } } The SerializeToMarkup method is similar to code that you have already seen. The serialize method of the WorkflowMarkupSerializer class is used to serialize the workflow model to a markup file using an XmlWriter.

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Figure 4-8. Durable Timer Service When the time elapses, the Workflow Management Service wakes the sleeping workflow instance from its persisted state in the Persistence Database and resumes the workflow s activities. AppFabric also knows how to take advantage of the new IIS/WAS auto-start feature. This feature enables you to start services when the machine starts up, rather than waiting for the first message. The AppFabric auto-start function allows one or more services to be automatically loaded as soon as the service is configured. This is useful for services that use non-activating channels. Examples of such channels include WCF communication mechanisms that do not automatically start a service, such as FTP or SMTP. Auto-start can also improve response time for services that must carry out initialization tasks before handling their first request.

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You also need this small amount of code in the Program.cs file: using System; namespace ConsoleDeserializeWorkflow { public class Program { static void Main(string[] args) { DeserializeWorkflowTest.Run(); Console.WriteLine("Press any key to exit"); Console.ReadKey(); } } } You can now build the solution and execute the ConsoleDeserializeWorkflow project. Before you execute this project, make sure that the SerializedCodedWorkflow.xoml file from the previous examples is in the executable directory. Also, make sure that the SharedWorkflows.dll assembly is in the directory. When you execute this project, you should see a new markup file named SerializedCodedWorkflowRevised.xoml created in the executable directory. If you open this file in the XML Editor, you will see that the value for the Message property has been modified as shown here: <ns0:WriteMessageActivity Message="This is a revised message" x:Name="writeMessagePositive" />

Note The mechanism for exchanging keys and certifying the origin of the script we just described is

Summary

commonly referred as public key infrastructure (PKI). It is widely used to establish trust on the Internet and has been used by people to verify different signatures and establish and verify trust to other persons or entities. The full PKI standard includes a lot more than binding a public key to a user identity. For example, it includes mechanisms for revoking certificates that have expired or have been compromised. In this chapter, I will cover signatures and key exchanges only.

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