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The point is that your preferred security tokens and your preferred hashing and encryption algorithms are simply a means to a bigger goal of establishing trusted communication, otherwise known in the Web services world as secure conversation. There is no single correct choice of technologies that you should always use. Instead, you need to be using those technologies that are appropriate for establishing a trusted, secure conversation between a given client and a Web service. The rules can change depending on who is doing the communicating. This chapter focuses on how you establish session-oriented, trusted communications using the WS-Secure Conversation specification. The great thing about the WS- specifications is that many of the concepts complement each other and build on each other. The understanding that you now have about WS-Security and WS-Policy will translate directly into the concepts behind WS-Secure Conversation. By the end of this chapter, you will have a good understanding of what constitutes secure conversation, and a broader appreciation for the usefulness of the WS-Security family of specifications.

Draw a box around any other important design elements, using the Slice Select tool to adjust the size of each box. Click Save for Web & Devices in the File drop-down list. Select the Slice Select tool, and double-click each design element you need to save to the Web. Select Image for Slice Type, and type the name you want for the saved image file, as shown in Figure 9-17. The remaining options are not used.

Figure 9-17. Select Image for Slice Type, and type the name you want for the saved image file. 6. After you are finished slicing the file, navigate to View Show, and select Slices to hide or display slices.

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Don t get us wrong we love JsUnit, but you may want to consider some other options The sharp folks at ThoughtWorks have released a test tool for Web applications called Selenium7 Selenium was developed to test an internal ThoughtWorks browser-based application, but they were kind enough to donate the code to the open-source world so the rest of us could take advantage of it Selenium runs in all the major browsers and can be used on the common operating systems Like JsUnit, Selenium tests run right in the browser, which makes them excellent for testing system functionality and browser compatibility For more information, see seleniumthoughtworkscom/indexhtml If you are using Java on your server side, you have a handful of other options HttpUnit is written in Java and allows you to emulate the browser.

The WS-Secure Conversation (and WS-Trust) specification provides the means for a client and a service to establish an optimized secure communication channel for a session, that is, an established duration of time. Secure conversation uses a security token that is procured by a service token provider following the initial handshake, or exchange of original security tokens, by the service and client. The security token is used to encrypt and sign all subsequent SOAP messages that are exchanged between the service and client. This process involves an initial amount of overhead, but once the channel is established, the client and service exchange a lightweight, signed security context token, which optimizes message delivery times compared with using regular security tokens. The security context token enables the same signing and encryption features that you are used to with regular security tokens. Secure conversation is analogous to communications over the HTTPS protocol. HTTPS establishes a secure channel for the duration of a session and ceases to be in effect once that session is over. The classic example is an e-commerce transaction, in which you browse a catalog over an unsecured channel, but then you establish a secure channel for the purpose of completing a sales transaction with the vendor. The communication needs to be secure because sensitive payment and order information is being exchanged, so the client and the vendor need to establish a secured channel for as long as it takes to complete the transaction. For performance reasons, the client does not need or even want to establish a continuous secure session for every interaction with the vendor. HTTPS is useful for providing ondemand secure communication for exactly as long as it is needed.

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