Back-of-device authentication with bod taps and bod shapes

This demonstration accompanies a paper accepted at MobileHCI'14. Back-of-device (BoD) authentication has shown to be significantly more secure than standard front-facing approaches, being BoD Shapes the most representative method found in the literature. With the aim of getting a better understanding and improving its usage, we developed BoD Taps as a novel alternative. Our experiments revealed that BoD Taps and BoD Shapes perform equally good at unlocking the device, but BoD Taps allows users to enter passwords about twice faster. Moreover, BoD Taps was perceived as being more usable and less frustrating than BoD Shapes. This demonstration showcases both authentication methods in action, aimed at comparing and discussing their features and potential improvements.