Sandboxed Execution and the Execution Manager in Microsoft Word

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Sandboxed Execution and the Execution Manager
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Sandboxed Execution refers to the concept that each application runs in its own environment, or sandbox, and that it has no access to applications running in different sandboxes on the same device. Applications running on the same Windows Phone 7 device are isolated from each other and must communicate with services provided by the Windows Phone 7 platform by using a well-defined standard mechanism. System files and resources are shielded from user applications. To store and retrieve application and configuration data, applications must use Isolated Storage, which is designed to be protected from access by any application other than the currently running one. For in-depth information on working with Isolated Storage, please refer to 13. To further ensure security and responsiveness of the Windows Phone 7 platform, Microsoft has built in separate provisions to make it even more secure. These provisions include the use of the Execution Manager, as well as granting only the rights an application absolutely requires to function. The Execution Manager monitors application resource usage in accordance with certain defined conventions. For instance, the Execution Manager may terminate an application in the background if it deems that an application in the foreground is not very responsive. Similarly, the Execution Manager may dismiss an application if it makes an excessive number of requests for phone resources. The Windows Phone Application Platform also tries to minimize the number of privileges granted to an application. For instance, if an application does not require the use of the location services library, Windows Phone will create a custom execution environment for the application that does not include the rights to that library. This way, the number of potential exploits against the application is minimized.
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Implementing Network Security
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If your application accesses sensitive data over the network, it is critical that this data is encrypted during transit from the remote location to the Windows Phone 7 device. Similarly, if your application requires authentication, it is important to implement a secure authentication mechanism within your application. Windows Phone 7 platform allows you to accomplish both of these objectives. Any time you have to transmit sensitive data from a remote location, you should use Secure Sockets Layer (SSL) protocol, an industry standard for encrypting data. And if your environment requires secure authentication, it is possible to use digital certificates on a Windows Phone 7 device for that authentication, eliminating the need for user names and passwords. In the next sections, you will walk through establishing SSL connections and configuring a certificate for secure authentication on a Windows Phone 7 device.
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CHAPTER 19 SECURITY
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Secure Sockets Layer protocol is a sophisticated way of securing connections between the client (Windows Phone 7 device) and cloud service, and it utilizes the concepts of asymmetric cryptography and certification authority (CA) hierarchies. When a Windows Phone 7 device initiates a secure connection to the remote service, it requests that service s certificate. That certificate is checked and the certification authority that issued that certificate is determined. Once the CA of the certificate is known, Windows Phone 7 client then checks its own installed list of certification authorities. If it finds a certification authority in its list, that implies that a trust relationship between the Windows Phone 7 device and the CA has been previously established, and that a secure connection between the phone and the remote server can be created. Windows Phone 7 devices come with several certification authorities pre-installed. This means that, most of the time, establishing an SSL connection will be a seamless experience. As long as the remote service obtained its certificate from a very well-known certification authority (such as VeriSign, for example), SSL connections can be created both from Internet Explorer on the phone, as well as from application code. The following walkthrough demonstrates how to test if you can establish a secure connection to the remote server (PayPal) that has a certificate issued by a well-known CA (VeriSign).
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