ZoomPass: A Zoom-Based Android Unlock Scheme on Smart Devices

Modern smart devices such as smartphones are able to provide various services, including checking online banking, watching video and listening to music. Due to the intelligence and popularity, such devices are also used as storage space for recording users' private information such as personal photos, credit card number, videos and more. This creates a need for protecting the devices from unauthorized access. Currently, many unlock schemes have been developed, in which Android unlock pattern is the most widely used scheme. However, traditional Android unlock pattern is vulnerable to different threats due to the limited pattern space. To enhance the security, one major direction is to combine biometric features with Android unlock pattern. In this work, motivated by this trend, we propose an enhanced Android unlock scheme based on zoom actions. More specifically, users can select two dots and perform a zoom action (either zoom-in or zoom-out) over each dot for authentication. In the study with 30 participants, our scheme demonstrates good performance in terms of usability and security.