To all the people that are worried that a robber would "hack" your door or use your stolen phone to get into your house, I have a question for you. Unless you advertise that you have this device on your door, how would that would-be-robber know you have a Lockitron on your door? You're not hanging this thing on the outside, so how would they know unless they were already inside your house? At that point, your robber would either be someone who broke in the old fashioned way, or its someone you probably know.
And sure, the thief would eventually see the app on your phone if they stole it, but if you don't put the app in an obvious spot, like in your tray, then by the time they discovered the app, you would have reset your Lockitron password or wiped the iPhone.
Relax people, like its been said before, if a robber wanted to break into your house bad enough, they will get in. And, if someone "hacked" your door lock with some crazy crypto device, Lockitron would also notify you on your iPhone that your door was unlocked. If you were not expecting someone to enter your home, call the cops.