Baseline Measurements of Shoulder Surfing Analysis and Comparability for Smartphone Unlock Authentication.

In this paper, we describe a novel approach to measure the susceptibility of smartphone unlock authentication to shoulder surfing attacks. In our methodology, participants play the role of attackers, viewing video-recorded footage of PIN and graphical password pattern authentication input with various camera angles, hand positions, phone sizes, and authentication length and strength. Based on the data collected and recording methodology developed, we aim to provide insight into the factors of mobile unlock authentication which best and least resist shoulder surfing attacks and examine scenarios where weaknesses may occur. The goal is to identify more effective guidance for mobile device users to avoid observational attacks. We also aim to advance the methodologies used to measure the shoulder surfing attack surfaces where baselines of comparisons to preexisting systems (e.g., PINs and patterns) are not standardized. Utilizing the methodology and recordings, other researchers may build upon this approach to analyze future systems and replicate our results.