CONFERENCE (INTERNATIONAL) SheetKey: Generating Touch Events by a Pattern Printed with Conductive Ink for User Authentication
Shota Yamanaka, Kunihiro Kato (The University of Tokyo), Tung D. Ta (The University of Tokyo), Kota Tsubouchi, Fuminori Okuya (The University of Tokyo), Kenji Tsushio (The University of Tokyo), Yoshihiro Kawahara (The University of Tokyo)
Graphics Interface 2020 (GI2020)
May 21, 2020
Personal identification numbers (PINs) and grid patterns have been used for user authentication, such as unlocking smartphones.However, these carry the risk that attackers will learn the PINs and patterns by shoulder surfing.We propose a secure authentication method that requires complicated and quick touch inputs that only can be accomplished by a sheet with a pattern printed with conductive ink, called SheetKey.Using SheetKeys, users can input a complicated combination of touch events within 0.3 s by just swiping the finger pad on the sheet.We investigated the requirements for producing SheetKeys, e.g., disc diameter for generating touch events.In a user study, 13 participants passed through the authentication by using SheetKeys at success rates of 78-87%, while attackers using manual inputs had a 0-27% success rates.We also discuss the degree of complexity based on the entropy and further improvements, e.g., typing passwords on alphabetical keyboards.