This looks like an interesting app for logging in "without passwords" by scanning QR codes using a smart phone and entering a passcode. (I consider a passcode to just be an insecure password, but we'll let that slide for now).
Unfortunately, the app crashes immediately on a 4s with iOS 5.1.1, so I can't test it out. This brings up a concern. If a bad update (like the current one) causes the app to not work with your device, you can not log into anything that uses this for authentication.
