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As mentioned, the big advantage of symmetric algorithms is performance. Conversely, the major problems with symmetric algorithms are as follows: Key exchange: If you are using symmetric algorithms to exchange data between two applications hosted by different parties, you have to exchange the key in a secure way. Brute-force attacks: If you use the symmetric key for a longer period of time, attackers might have enough time to decrypt traffic by just trying any valid combination of bits in a key. Therefore, with an increasing bit size, the strength of the key increases, as explained previously. But generally this means you should use a different key in regular intervals anyway. Long-term key management: If you have to update keys in regular intervals, you have to exchange them in regular intervals, which might lead to additional security risks. Furthermore, you have to store the key in a secure place. Symmetric algorithms are not enough for secure systems, and that s why asymmetric algorithms exist.

You use this to establish whether sessions are allowed, not allowed, or required by this service contract.

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Asymmetric algorithms try to solve some of the problems of symmetric algorithms. They are based on mathematical methods that require different keys for encryption and decryption. Usually the key used for encryption is called a public key. You can give this key to anyone who wants to send encrypted information to you. On the other hand, the private key is the only key that can be used for decryption. Therefore, if you are the only one with access to the private key, you are the only person who is able to decrypt the information. This fact makes key exchange between parties definitely easier, because you don t need to transmit the key that can decrypt sensitive data. Table 25-3 lists the asymmetric algorithms supported by the .NET Framework. Table 25-3. Asymmetric Algorithms Supported by .NET

Methods that you wish to use within the WCF framework must be attributed with the [OperationContract] attribute, which can also be configured with various named properties. You can use the properties shown in Table 25-7 to declare that a given method is intended to be one-way in nature, supports asynchronous invocation, requires encrypted message data, and so forth (again, many of these values might be ignored based on your binding selection). Table 25-7. Various Named Properties of the [OperationContract] Attribute

Indicates whether the operation is implemented asynchronously using a Begin/End method pair on the service. This allows the service to offload processing to another server-side thread; this has nothing to do with the client calling the method asynchronously! Specifies whether this operation can be the initial operation in a session. Indicates whether the operation consists of only a single input message (and no associated output). Specifies whether the WCF runtime should attempt to terminate the current session after the operation completes.

384 16384 (8-bit increments) 512 1024 (64-bit increments)

@ManyToMany( targetEntity=Group.class, cascade={CascadeType.PERSIST, CascadeType.MERGE}) @JoinTable(name="users_groups", joinColumns=@JoinColumn(name="user_id"), inverseJoinColumns=@JoinColumn(name="group_id")) private List<User> users; public Integer getGroupId() { return groupId; } public void setGroupId(Integer groupId) { this.groupId = groupId; } public String getGroupName() { return groupName; } public void setGroupName(String groupName) { this.groupName = groupName; } public String getGroupDescription() { return groupDescription; } public void setGroupDescription(String groupDescription) { this.groupDescription = groupDescription; } public List<User> getUsers() {

For the initial example, you don t need to configure the ObtainAnswerToQuestion() method with additional traits; this means you can use the [OperationContract] attribute as currently defined.

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Finally, recall that the use of interfaces is not required when building WCF service types. In fact, it is possible to apply the [ServiceContract] and [OperationContract] attributes directly to the service type itself: // This is only for illustrative purposes // and not used for the current example. [ServiceContract(Namespace = "http://MyCompany.com")] public class ServiceTypeAsContract

When you use RSA and DSA, you will recognize that only RSA supports the direct encryption and decryption of values. The DSA algorithm as its name Digital Signature Algorithm implies can be used only for signing information and verifying signatures. The big problem is that asymmetric algorithms are much slower (depending on the size of the data you want to encrypt) than symmetric algorithms. This will affect the performance of your application if you need to exchange data through lots of requests. Therefore, technologies such as SSL use asymmetric algorithms at the beginning when establishing a connection session. Through

{ [OperationContract] void SomeMethod() { } [OperationContract] void AnotherMethod() { } } You can take this approach; however, you receive many benefits if you explicitly define an interface type to represent the service contract. The most obvious benefit is that you can apply a given interface to multiple service types (authored in a variety of languages and architectures) to achieve a high degree of polymorphism. Another benefit: You can use a service contract interface as the basis of new contracts (using interface inheritance), without having to carry any implementation baggage. In any case, your first WCF service library is now complete. Compile your project to ensure you do not have any typos.

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