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In 20, you learned how to use hashing to protect passwords With hashing, you store a digital fingerprint of the original data, not the data itself As a result, you have no way to reverse the hashing process to retrieve the original data All you can do is hash new data and perform a comparison The hashing approach is the most secure practice for validating passwords However, it s not much help when you want to protect sensitive data that you need to decrypt later For example, if you re creating an e-commerce application, you probably want to store a user s credit card information so it can be reused in later orders In this scenario, your application needs to be able to retrieve the credit card details on its own Hashing doesn t apply Often developers deal with this situation by storing sensitive data in clear text.

Understanding the notion of a contract is the key to building a WCF service. While not mandatory, the vast majority of your WCF applications will begin by defining a set of .NET interface types that are used to represent the set of members a given WCF service will support. Specifically, interfaces that represent a WCF contract are called service contracts. The classes (or structures) that implement them are called service types. WCF service contracts are adorned with various attributes, the most common of which are defined in the System.ServiceModel namespace. When the members of a service contract (the methods in the interface) contain only simple data types (e.g., numerical data, Booleans, and string data), you can build a complete WCF service using nothing more than the [ServiceContract] and [OperationContract] attributes. However, if your members expose custom types, you will need to use types in the System.Runtime.Serialization namespace (see Figure 25-5) of the System.Runtime.Serialization.dll assembly. Here you will find additional attributes (e.g., [DataMember] and [DataContract]) to fine-tune the process of defining how your composite types are serialized to and from XML when they are passed to and from service operations. Strictly speaking, you are not required to use CLR interfaces to define a WCF contract. Many of these same attributes can be applied on public members of a public class (or structure). However, given the many benefits of interface-based programming (e.g., polymorphism and elegant versioning), it is safe to consider using CLR interfaces to describe a WCF contract a best practice.

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They assume that because the data is kept in a secure server-side storage location, they don t need to go to the additional work of encrypting it However, security experts know this is not true Without encryption, a malicious user needs to gain access to the server for only a matter of minutes or even seconds to retrieve passwords or credit card numbers for every customer Security breaches can occur because of poor administrative policies, weak administrator passwords, or other exploitable software on the server Problems can even occur because of hardware maintenance; in fact, dozens of companies have reported selling or discarding old server hard drives without properly erasing the sensitive customer data they contained Finally, many organizations have a privacy policy that explicitly pledges to keep customer information confidential and encrypted at all times.

Figure 25-5. System.Runtime.Serialization defines a number of attributes used when building WCF data contracts

Once you define and implement a contract (or a set of contracts) in your service library, the next logical step is to build a hosting agent for the WCF service itself. As mentioned previously, you have a variety of possible hosts to choose from, all of which must specify the bindings used by remote callers to gain access to the service type s functionality. Choosing a set of bindings is one area that makes WCF development quite different from .NET remoting and/or XML web service development. WCF ships with many of binding choices, each of which is tailored to a specific need. If none of the out-of-the-box bindings fits the bill, you can create your own by extending the CustomBinding type (something you will not do in this chapter). A WCF binding can specify the following characteristics: The transport layer used to move data (HTTP, MSMQ, named pipes, and TCP) The channels used by the transport (one-way, request-reply, and duplex) The encoding mechanism used to deal with the data itself (e.g., XML and binary) Any supported web service protocols (if permitted by the binding), such as WSSecurity, WS-Transactions, WS-Reliability, and so on

If a security breach occurs and the company is forced to notify users that their data is at risk because it wasn t properly encrypted, the company can face significant embarrassment and loss of trust To avoid these problems and ensure that data is safe, you need to encrypt sensitive information stored by your application..

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