How to use DataProtectionProvider?

Question

I am new to WinRT and studied its security features, and I have a few questions regarding the Windows.Security.Cryptography.DataProtection.DataProtectionProvider class:

• What encryption algorithm does it use (e.g. AES or TwoFish)?
• According to the MSDN document, you can use a symmetric key for encryption, does anyone know what you pass as the argument of the constructor "protectionDescription" if you want to do this?
• Finally, in the MSDN document, you need to use the parameterless constructor before calling the UnprotectAsync method. Why don't you need to pass a key to decrypt the data?

Thank.

Answer 1

, Metro, Ritch, , Windows.Security.Cryptography.Core .

Answer 2

. DataProtectionProvider.