Umbraco -Implement google 2 factor authentication api
A Sample application ... Generating QR Code on the login and validate the QR before redirecting the user to Dashboard .
Google.Authenticator -- Generate the QR and Code
GoogleAPI ---API to generate and validte the QR with Code
In Umbraco -- Change the $scope.loginSubmit Umbraco\Js\umbraco.controllers.js and Umbraco\Js\umbraco.services.js to call the api