NFC Safe is an interesting Windows Phone app that allows you to secure important date, images and credentials on your Windows Phone. The app utilizes your Windows Phone's NFC abilities to create a NFC Tag key that will open the app. Otherwise, your information is locked up and secure from prying eyes.
NFC Safe includes OneDrive support to back up your information, Live Tile support for direct access to folders and you can create multiple NFC tags just in case you are prone to losing things. It's an interesting app and a handy way to keep things private on your Windows Phone.