University of Ottawa - Carleton University
Ottawa-Carleton Institute for Computer Science (OCICS) Presentation
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October 12, 2012 @ 10:00a.m.
TMD - A New Graphical Password Scheme for Mobile Devices
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Speaker: Hsin-Yi Chiang
Location: 3101 CB (Canal Building) |
ABSTRACT
As the technology evolved, it is made possible that mobile devices have the ability to connect to the internet and access various personalized remote services such as online banking or social medias. To ensure that personal information is only revealed to the authorized users, it is important that we have a secure, reliable and usable scheme to authenticate users. Currently, similar to traditional computers, the most wildly used authentication scheme on mobile device is the text-based passwords. On the other hand, different from those computers, modern mobile devices use touchscrees instead of physical keyboards as the input interface. To enter text passwords, mobile devices often use virtual keyboard which is a simulation of physical displayed on the touchscreen. However, due to the limited size of the mobile device screens, virtual keyboards are designed with small key sizes and do not support combination keys. A secure text password is often referred as passwords that contain upper and lower case, numbers and special characters. To type a secure password using virtual keyboards, users are forced to navigate between several keyboards that contain different character sets resulting more time spent and mistakes made.
To increase of usability of user authentication process, we are proposing to use graphical passwords instead of text-based password to authenticate users on mobile devices. A graphical password scheme is an authentication system that works by having users to select or manipulate image(s). There are many reasons why we are proposing to use graphical password schemes to improve the usability of user authentication process: (1) the interface design of the operating systems on mobile device is also graphical oriented; (2) based on previous studies, humans can remember images more easily than texts.; and (3) graphical passwords can easily be converted into strings of text which can be used on top of the current text authentication systems. Many graphical password schemes have been proposed before; however, the proposed schemes are mostly designed for devices with a large display and a mouse. As the result, the usability of existing graphical password schemes when using on mobile devices is not known. With that said, in this study, we are exploring the possibility of designing a new graphical password scheme that is optimized for mobile devices. We designed a new graphical password scheme named Touchscreen Multi-layer Drawing (TMD) which is aimed to increase the usability of graphical password scheme on mobile devices.
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