The new biometric security 'feature' if the Apple iPhone has already been breached using a simple photograph & common everyday items.
It took members of the renowned Chaos Computer Club the blink of an eye to defeat the iPhone 5s secured with TouchID.
Here is a short video. http://www.youtube.com/watch?v=HM8b8d8kSNQ
Bumometrics. You may as well send a photo of your ass, it is probably more 'secure'..
p.s. For obvious reasons I can't post my own bumometrics photo here but you can see a photo of my cute little one here... http://twitpic.com/b52u2g/full