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the first communication steps, traffic between the client and the server is secured through asymmetric encryption (the client encrypts with a public key, and the server decrypts with a private key). With these steps the client and the server can exchange a symmetric key securely. This symmetric key then secures traffic for any subsequent communication through symmetric encryption. This combines the advantages of symmetric and asymmetric encryption. Of course, you have to find a way to securely store the private key so that unauthorized people don t have a chance to access it.

Source Code You can find the MagicEightBallServiceLib project under the MagicEightBallServiceHTTP directory of 25.

If you don t store the private key on an external device such as a smart card, you create a chance of someone gaining unauthorized access (and even the smart card is not completely secure, because you can lose it), especially if actors are administrators of machines. But you should always make your solution as secure as possible and raise the bar for attackers. Therefore, any additional security mechanism (gatekeeper) will make life for a potential attacker harder.

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You are now ready to define a host. Although you would host a production-level service from a Windows service or an IIS virtual directory, you will make your first host a simple console named MagicEightBallServiceHost. Once you create this new Console Application project, add a reference to the System.ServiceModel.dlly and MagicEightBallServiceLib.dlly assemblies, and then update your initial code file by importing the System.ServiceModel and MagicEightBallServiceLib namespaces: using using using using System; System.Collections.Generic; System.Linq; System.Text;

return users; } public void setUsers(List<User> users) { this.users = users; } } Before running the command mvn install, remember to map the new Group entity class into your Hibernate configuration file. After compiling, you should see a new database link table called groups_users and the two relationships to it within both the users and groups tables (see Figure 5-19).

The abstract encryption classes actually serve two purposes. First, they define the basic members that encryption implementations need to support. Second, they provide some functionality, through the Shared Create() method, that you can use directly without creating a class instance. This method allows you to create one of the concrete implementation classes without needing to know how it is implemented. For example, consider the following line of code: Dim crypt As DES = DES.Create() The Shared Create() method returns an instance of the default DES implementation class. In this case, the class is DESCryptoServiceProvider. The advantage of this technique is that you can code generically, without creating a dependency on a specific implementation. Best of all, if Microsoft updates the framework and the default DES implementation class changes, your code will pick up the change seamlessly. This is particularly useful if you are using a CryptoAPI class, which could be replaced with a managed class equivalent in the future. In fact, you can work at even higher level if you want by using the Shared Create() method in one of the cryptographic task classes. For example, consider this code: Dim crypt As SymmetricAlgorithm = SymmetricAlgorithm.Create() This creates an instance of whatever cryptography class is defined as the default symmetric algorithm. In this case, it isn t DES but is Rijndael. The object returned is an instance of the RijndaelManaged implementation class.

using System.ServiceModel; using MagicEightBallServiceLib; namespace MagicEightBallServiceHost { class Program { static void Main(string[] args) { Console.WriteLine("***** Console Based WCF Host *****"); Console.ReadLine(); } } }

The first step you must take when building a host for a WCF service type is to decide whether you want to define the necessary hosting logic completely in code or to relegate several low-level details to an application configuration file. As mentioned previously, the benefit of *.config files is that the host can change the underlying plumbing without requiring you to recompile and redeploy the executable. However, always remember this is strictly optional because you can hard-code the hosting logic using the types within the System.ServiceModel.dll assembly. This console-based host will use an application configuration file, so insert a new Application Configuration File into your current project using the Project Add New Item menu option.

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