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Users with limited use of their hands, such as people suffering fromdisabilities of the arm, shoulder, and hand (DASH), face challenges whenauthenticating with computer terminals, specially with publicly accessibleterminals such as ATMs. A new glass wearable device was recently introduced byGoogle and it was immediately welcomed by groups of users, such as the onesdescribed above, as Google Glass allows them to perform actions, like taking aphoto, using only verbal commands. This paper investigates whether glasswearable devices can be used to authenticate users, both to grant access(one-time) and to maintain access (continuous), in similar hands-free fashion.We do so by designing and implementing Gauth, a system that enables users toauthenticate with a service simply by issuing a voice command, while facing thecomputer terminal they are going to use to access the service. To achieve thisgoal, we create a physical communication channel from the terminal to thedevice using machine readable visual codes, like QR codes, and utilize thedevice's network adapter to communicate directly with a service. Moreimportantly, we continuously authenticate the user accessing the terminal,exploiting the fact that a user operating a terminal is most likely facing itmost of the time. We periodically issue authentication challenges, which aredisplayed as a QR code on the terminal, that cause the glass device tore-authenticate the user with an appropriate response. We evaluate our systemto determine the technical limits of our approach.

Hands-Free One-Time and Continuous Authentication Using Glass Wearable Devices