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So, you definitely have to protect the key somehow. You might want to encrypt the key on its own, but then you need another encryption key. Windows supports a built-in mechanism for storing and protecting secrets. This mechanism uses a machine key generated with the system installation for encrypting data. Only the local operating system (the system s local security authority) has access to this machine key. Of course, the machine key is unique for every installation. Windows supports the Data Protection API for protecting data with this key. You don t have direct access to the key when using this API; you just tell the system to encrypt or decrypt something with the machine s key. So, this solves the problem of key management: your application could encrypt the key used by your application through DPAPI. For this purpose, the .NET Framework supports the class System.Security.Cryptography.ProtectedData, which you can use as follows: Dim ProtData As Byte() = ProtectedData.Protect(ClearBytes, Nothing, DataProtectionScope.LocalMachine) Possible scopes are LocalMachine and CurrentUser. While the first option uses the machine key, the second one uses a key generated for the currently logged-on user s profile. (In the case of roaming profiles, this key is machine independent.) If a user is the administrator of the machine and has the necessary know-how, he can decrypt the data by writing a program that calls the previous function. However, this definitely raises the bar and makes it harder to access the key. And if the user is not the administrator and has no permission to use the DPAPI, she cannot decrypt data encrypted with the machine key.

This property gets a value that indicates the current state of the communication object, which is represented by the CommunicationState enum (e.g., opened, closed, and created).

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Don t use the DPAPI to encrypt information in your database. Although it is easy to use the DPAPI with .NET 2.0, this method has one problem: encrypted data is bound to the machine if you use the DataProtectionScope.LocalMachine setting. Therefore, if the machine crashes and you have to restore your data on another machine, you will lose all the encrypted information. If you use the DPAPI for encrypting the key as described previously, you should have a backup of the key in another secure place. If you want to use the DPAPI in web farm scenarios, you have to run your application under a domain user account and use the key created for the user s profile (DataProtectionScope.CurrentUser). We recommend creating a separate domain for your web farm so that you don t have to use a domain user of your company s internal domain network.

You can see some additional aspects of ServiceHost in action by updating your Program class with a new static method that prints out the ABCs of each endpoint used by the host: static void DisplayHostInfo(ServiceHost host) { Console.WriteLine(); Console.WriteLine("***** Host Info *****"); foreach (System.ServiceModel.Description.ServiceEndpoint se in host.Description.Endpoints) { Console.WriteLine("Address: {0}", se.Address); Console.WriteLine("Binding: {0}", se.Binding.Name); Console.WriteLine("Contract: {0}", se.Contract.Name); Console.WriteLine(); } Console.WriteLine("**********************"); } Now assuming that you call this new method from within Main() after opening your host: using (ServiceHost serviceHost = new ServiceHost(typeof(MagicEightBallService))) { // Open the host and start listening for incoming messages. serviceHost.Open(); DisplayHostInfo(serviceHost); ... } Doing this will generate the statistics shown in the following output: ***** Console Based WCF Host ***** ***** Host Info ***** Address: http://localhost:8080/MagicEightBallService Binding: BasicHttpBinding Contract: IEightBall ********************** The service is ready. Press the Enter key to terminate service.

As mentioned, symmetric encryption algorithms use one key for encrypting and decrypting data. The class you will create basically has the following structure and can be used for encrypting and decrypting string data: Public Class SymmetricEncryptionUtility Dim Shared _ProtectKey As Boolean Dim Shared _AlgorithmName As String Private Sub New() End Sub Private Shared Property AlgorithmName() As String Get Return _AlgorithmName End Get Set _AlgorithmName = Value End Set End Property

Like any XML element, <system.serviceModel> can define a set of sub-elements, each of which can be qualified using various attributes. While you should consult the .NET Framework 4.0 SDK documentation for full details regarding the set of possible attributes, here is a skeleton that lists the critical sub-elements: <system.serviceModel> <behaviors> </behaviors> <client> </client> <commonBehaviors> </commonBehaviors> <diagnostics> </diagnostics> <comContracts> </comContracts> <services> </services> <bindings> </bindings> </system.serviceModel> You ll see more exotic configuration files as you move through the chapter; however, you can see the crux of each sub-element in Table 25-9. Table 25-9. Sub-elements of <service.serviceModel>

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