Exporting a Self-Signed Certificate in Office Word

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Exporting a Self-Signed Certificate
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It is possible to establish secure connections to Microsoft Exchange from the Windows Phone 7 device using self-signed certificates. The first step in establishing an Exchange connection secured by a self-signed certificate between the client and the server is to export the certificate from the server. The next walkthrough shows you how to do that. This walkthrough assumes that you are using Internet Explorer 8 to export certificates. 1. On the server, open Internet Explorer, and click Tools Internet Options. If the menu bar with Tools menu option is not visible, press the Alt key.
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Figure 19 6. Certificate authority error on the Windows Phone 7 Emulator 2. In the window that comes up, click the Content tab, and then click the Certificates button. In the dialog that comes up, select the Trusted Root Certification Authorities tab. The self-signed certificate that you created should be listed in this tab you can scan the Friendly Name column and look for the wp7cert name to find it, as shown in Figure 19 7.
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Figure 19 7. List of trusted root CAs, with self-signed certificate highlighted 3. 4. Click on the Export button, then click the Next button. On the next screen, select No, do not export the private key (the default option) and click Next. On the next screen, choose the DER Encoded binary X.509 format (default option) and click Next. Finally, select the folder, name the file wp7cert (make sure to put it somewhere you can find it later!), click Next, and then click Finish. You should get a message notifying you that the export was successful.
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With the certificate exported, you are now ready to finalize the trust relationship between the Windows Phone 7 device and the server secured by a self-signed certificate. You will do that in the next section.
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Installing Self-Signed Certificate on Windows Phone 7
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The easiest way to install a self-signed certificate on Windows Phone 7 device or emulator in the first release of Windows Phone 7 framework is to simply e-mail it. Then, let the built-in Windows Phone 7 features recognize the certificate file and install it on the device. The next few steps will guide you through this process.
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Open or navigate to your e-mail program; for instance, if you use Hotmail as your default e-mail, log in to Hotmail.com and create an e-mail message to yourself. In that e-mail, add an attachment the wp7cert.cer file you created previously. Send e-mail to yourself. From the Windows Phone 7 device or emulator, access the e-mail message you just sent. Once you click the wp7cert.cer attachment, the Windows Phone 7 framework should prompt you to open the certificate file. Go ahead and click (or tap) the screen to get the Install Certificate prompt shown in Figure 19 8. Then, click the Install Certificate button. After the installation, click the OK button.
You are now familiar with how to secure data in transit from a remote service to the Windows Phone 7 device. You have seen how to use SSL with both trusted third-party certificates from established certification authorities and self-signed certificates. In the next section, you will take a look at securely storing data on your Windows Phone 7 device by encrypting it.
Implementing Data Security
In this section, you will learn how to secure data that gets stored on a Windows Phone device. While the data in Isolated Storage is sandboxed for each application i.e., an application cannot access the contents of Isolated Storage of another application it is still important to encrypt sensitive data stored on the device. Encrypting data makes it impossible for anybody other than the data owner to read that data, something that is especially critical for enterprise users. Windows Phone 7 provides a powerful subset of .Net encryption classes, which make data encryption not only possible, but extremely easy on this device. The following data encryption algorithms are supported on Windows Phone 7: AES HMACSHA1 HMACSHA256 Rfc2898DeriveBytes SHA1 SHA256
As you will see shortly in the next walkthrough, many of these algorithms complement each other to provide a robust data encryption strategy for Windows Phone 7 devices. But first, let s briefly review the purpose of each of the supported encryption algorithms. AES (stands for Advanced Encryption Standard) is a symmetric encryption algorithm. That means that it uses the same key (password) to encrypt and decrypt data. Since the key used to encrypt/decrypt data could be easy to guess by iterating through words in a dictionary in an automated manner, an additional secret key is added during the encryption process.
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