http://www.codeproject.com/Articles/439874/Web-service-on-Windows-Phone
http://www.c-sharpcorner.com/UploadFile/99bb20/consume-web-service-in-metro-style-app/
加密：
http://msdn.microsoft.com/en-us/library/windowsphone/develop/system.security.cryptography.protecteddata%28v=vs.105%29.aspx