SemanticLock: A Single Factor Graphical Authentication for Mobile Devices

SemanticLock: A Single Factor Graphical Authentication for Mobile Devices

Date: Wednesday, February 6, 2019

Time: 3:00 PM

Location: 235 Weir Hall

Speaker: Dr. Charles Fleming


Abstract: In this talk I will introduce SemanticLock, a simple, fast, and memorable single factor graphical authentication approach for mobile devices. SemanticLock uses a set of graphical images as password tokens to construct a semantically memorable story representing the user's password. While graphical passwords have been shown in some cases to have lower entropy than other password types, we avoid this problem by studying user preferences and selecting images that avoid any type of explicit or implicit bias, resulting in an effective password space that is essentially the same as the total password space. Results of a five-week user study comparing SemanticLock against other authentication systems show that SemanticLock outperforms or matches PIN and PATTERN in speed, user acceptance, security, usability and like-ability and is significantly more memorable.


Bio: Charles Fleming is an Associate Professor in the Department of Computer Science and Software Engineering at Xi'an Jiaotong-Liverpool University.  He received his PhD in Computer Science from the University of California Los Angeles and a BS degree in Mathematics from the University of Southern Mississippi.  His research interests include security and privacy, computer vision and machine learning, and the intersection of the two fields.