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CHAPTER 19 SECURITY
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CryptoStreamMode.Write); byte[] data = Encoding.UTF8.GetBytes(dataToEncrypt); crStream.Write(data, 0, data.Length); crStream.FlushFinalBlock(); //Return Base 64 String return Convert.ToBase64String(memStream.ToArray()); } finally { //cleanup if (crStream != null) crStream.Close(); if (memStream != null) memStream.Close(); if (aes != null) aes.Clear(); } } 2. Code the Decrypt method. The Decrypt method is the inverse of Encrypt: it takes data to decrypt, password and salt as parameters, and returns an input string. Since AES is a symmetric algorithm, the same password and salt values must be used to decrypt data as were used to encrypt it. The Decrypt method initializes the Rfc2898Bytes key and uses it to create Decryptor for data.
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public string Decrypt(string dataToDecrypt, string password, string salt) { AesManaged aes = null; MemoryStream memStream = null; CryptoStream crStream = null; try { Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(password, Encoding.UTF8.GetBytes(salt)); aes = new AesManaged(); aes.Key = rfc2898.GetBytes(aes.KeySize / 8); aes.IV = rfc2898.GetBytes(aes.BlockSize / 8); memStream = new MemoryStream(); crStream = new CryptoStream(memStream, aes.CreateDecryptor(), CryptoStreamMode.Write); byte[] data = Convert.FromBase64String(dataToDecrypt); crStream.Write(data, 0, data.Length); crStream.FlushFinalBlock(); byte[] decryptBytes = memStream.ToArray(); return Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length); } finally
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{ if (crStream != null) crStream.Close(); if (memStream != null) memStream.Close(); if (aes != null) aes.Clear(); } }
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Add code to call the Encrypt method when the user clicks the Encrypt button. Double-click the Encrypt button in MainPage.xaml and add the following code to the click event handler:
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txtEncryptedData.Text = Encrypt(txtDataToEncrypt.Text, txtPassword.Text, txtSalt.Text); 4. Finally, add code to call the Decrypt method when the user clicks the Decrypt button. Double-click the Decrypt button in MainPage.xaml and add the following code to the Click event handler:
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txtDecryptedData.Text = Decrypt(txtEncryptedData.Text, txtPassword.Text, txtSalt.Text); Press F5 to run the application. Enter some data (for example, Classified Information ), a password (for example, test ), and salt (note that it must be at least 8 characters long, otherwise AES classes will throw an exception), and observe the values being encrypted in the Encrypted Data textbox. Press Decrypt and you should see the original text in the Decrypted Data field. Note that if you enter the password or salt values that are different between encryption and decryption, the application will raise an error. Now that you understand the cryptography framework on the Windows Phone 7, it s time to take a look at the physical security of the device.
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Figure 19 10. User interface for the AESEncryption application
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Understanding Device Physical Security
With Windows Phone 7, customers rarely have to worry about sensitive data ending up in malicious hands if the device is lost or stolen. That is because several standard features that come complimentary with the phone (i.e., no extra charges) make it possible to feel confident about the security of the device. In this section, we will walk you through the Windows Phone 7 physical security safeguards that Microsoft provides.
Map It
From an individually customized web site, Windows Phone 7 users will be able to see the location of their phones using Bing maps.
Ring It
From that same web site, you can instruct the phone to ring for 60 seconds using a special ringtone, even if the ring tone has been turned off.
CHAPTER 19 SECURITY
Lock It and Display a Message
You can also lock the phone from the web site and display a custom message to instruct people who may have found your phone on how to get in touch with you.
Erase It
Finally, if all is lost and there is no hope of recovering the phone, you can remotely wipe all of the data from that phone and reset it to factory settings. As you can see, the Windows Phone 7 security story is very compelling, especially for the first generation of this device. You can expect this story to only become better and more feature-rich in the very near future. Certainly, more and more features from the full .NET framework will find their way onto the phone, which should further contribute to the security of the device.
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