KeyMe lets you scan keys from your phone, creating a digital version of your physical key. It sends confirmation mail every time theres activity on your account. The app is designed to help people who do things like wander outside to get their newspaper in their slippers, only to hear the decisive click! of a door locking shut behind them. KeyMe’s security page assures the burglary-wary that only you can scan your keys It also says that its scanning process is designed to strictly prevent any use of flyby pictures”]
Source: https://nakedsecurity.sophos.com/2014/07/28/how-to-break-into-peoples-homes-with-your-mobile-phone/