Disputas: Davrondzhon Gafurov

Prøveforelesning

Bedømmelseskomité

Professor Heikki Ailisto, VTT Technical Research Centre of Finland
Professor Simone Fischer-Hübner, Department of Computer Science, Karlstad Universitet, Sverige
Professor Josef Noll, University Graduate Center, Kjeller

Leder av disputas:  Tone Bratteteig

Veileder:  Einar Snekkenes and Chunming Rong

Sammendrag

The research resulting in the present thesis has been carried out at Norwegian Information Security Lab, Gjøvik University College. The overall goals of this work are to investigate the feasibility of user authentication based on human gait (walking style) using small and wearable sensors, and to analyze its security strength. For collecting motion, accelerometer sensors are used and attached to various places on the body or clothing of the person. Our analyses indicate that the motion of the following places in the body can provide some identity information: foot, arm, hip and trousers pocket. We also analyze the robustness of hip-based user authentication against various types of attack. Our findings reveal that such authentication is robust against mimicking attacks but might be vulnerable against knowledgeable impostors who know the closest person in the database or the gender of the person. The possible application for such authentication method can be on improving security in mobile phones. Nowadays users can store their personal and private data (images, videos etc.) in them and can even use mobile phones in banking and commerce. All of these increase the risk of being the target of an attack not only because of the phone value per se but also because of the stored information and provided services. For improving security, a periodic re-verification of the authenticated user is highly desirable. Protection mechanism in most mobile phones is based on PIN codes, which is difficult to adapt for periodic re-verification. Indeed, the process of frequently entering a PIN code into a mobile phone is explicit, requires user cooperation and can be very inconvenient and annoying. User authentication based on gait using small sensors offers new opportunities for unobtrusive and periodic re-verification of the identity. The sensor can be integrated with mobile phone hardware. Whenever user carrying a mobile phone (e.g. in the pocket or hip) walks his identity is re-verified unobtrusively without requiring explicit action.

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