Windows 8 Data Management

Here is a compact yet deep technical exploration of how Windows 8 and Windows Phone 8 handles data.

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Summary

Mutual authentication is not yet supported because SSL Client certificates are not supported.

Data Encryption

Protect data at rest.

Data Encryption API uses an encryption key that is private to each specific device.

To encrypt sensitive data usign ProtectedData:

private void StoreCredentials(){
	// Convert user name and password to a byte[]:
	byte[] secretByte= Encoding.UTF8.GetBytes(TBusername.Text + "||" + TBpassword.Text );
	// Encrypt username using the Protect() method:
	byte[] protectedSecretByte = ProtectedData.Protect(secretByte, null);
	// Create file in app isolated storage:
	IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication();
	IsolatedStorageFileStream writestream =
		new IsolatedStorageFileStream(FilePath, System.IO.FileMode.Create, System.IO.FileSAccess.Write, file);
		// Write data to file:
		Stream writer = new StreamWriter(writestream).BaseStream;
		writer.Write(protectedSecretByte, 0, protectedSecretByte.Length);
		writer.Close();
	writestream.Close();
}

To decrypt data:

	// Retrieve protected data:
	IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication();
	IsolatedStorageFileStream readstream =
		new IsolatedStorageFileStream(FilePath, System.IO.FileMode.Create, System.IO.FileSAccess.Read, file);
		// Read data from file:
		Stream reader = new StreamReader(readstream).BaseStream;
		byte[] encryptedDataArray = new byte[reader.length];
		reader.read(encryptedDataArray, 0, encryptedDataArray.Length);
		reader.Close();
	readstream.Close();

SkyDrive

http://www.windowsazure.com/en-us/develop/mobile/

using Microsoft.WindowsAzure.MobileServices;

Add Reference to Windows Phone > Extensions:

Windows Azure Mobile Services Managed Client

Authentication with Twitter.

Has multi-client support.

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