You think your phone is a target for would-be identity thieves now? Wait until this phone-as-method-of-payment madness touches down – it’s about to get madder. As such, we’re probably gonna need more security measures, right? A password certainly isn’t enough, and besides, you don’t want to have to input your password every time anyway. Well, get a load of this. Or, half a load at least, if you’re strapped for time. Researchers have been working on using the built-in accelerometers in modern smartphones to measure a person’s gait – that is, the way he or she walks – to identify the owner of the phone….