to protect sensitive information using reauthentication in SP2013

Hi Team,

I am totally new with SP2013. I have a requirement to protect sensitive data in the site by reauthenticating the user. I googled around and decided to move on the sensitive data into another web application. 

But since I am using Windows authentication I dont think that I will get popup for reauthentication.

Since I am totally new including the environment, Request you to please suggest in a way that user cannot get the url through view source also.

I know in SP2010 this can be done through "Loginas another user" through server side coding in cs file but how to proceed in SP2013 and which webpart to choose to get authentication popup.

Thanks

Any help is really appreciated.

Thanks Ba$va