Guessing smart phone PINs by monitoring the accelerometer
I came across an interesting solution to this while paying at a restaurant in Ecuador: they used an Android device which randomized the position of the numbers of the on-screen keypad before each transaction.The original intent is to make it much harder for onlookers to guess your pin based on finger movements. This could however apply equally well to the usecase of the article.It is a bit of a usability trade-off though as you can't enter a pin using muscle memory alone anymore, as you must first understand the current keypad layout.