Researchers have developed a solution that provides continuous authentication on devices by using signals created when a user's wrist interacts with the touchscreen.In their paper, researchers Christian Holz and Marius Knaust outline a method that they say would integrate continuous authentication into touch interaction.The scientists have developed a watch prototype called “Bioamp” which modulates a signal onto the user's body through skin using a periodic electric signal.”We propose biometric touch sensing, a new approach to representing touch events that enables commodity devices to seamlessly integrate authentication into interaction.”In their paper, Holz and Knaust use the device with Windows 8 and demonstrate it in the context of various use cases, including access permissions and protecting private screen contents on personal and shared devices.They argue that incorporating user authentication on commodity touch devices into all interaction is more secure than password-protected devices that only display login screens before permitting regular interaction.”The key feature of biometric touch sensing is what is absent from all interaction: password dialogs that introduce an explicit step for authentication and interrupt direct interaction”.In April, a team led by Holz predicted that users could soon be relying on diverse body parts like ears or knuckles to authenticate themselves, with no hardware needed for enrolment except a capacitive touchscreen. In a presentation at the 2015 Computer-Human Interaction Conference (CHI) in Seoul, Yahoo researchers demonstrated a solution called Bodyprint that can scan users' ears, knuckles, palms and fingers when they are pressed against the touchscreen.