Glass OTP: Secure and Convenient User Authentication on Google Glass

Wearable computing devices have become increasingly popular and while these devices promise to improve our lives, they come with new challenges. This paper focuses on user authentication mechanisms for the Google Glass device (Glass). Glass only has three sources of input: a camera, a microphone, and a touchpad. This limited set of interfaces makes the use of standard passwords infeasible or cumbersome. We therefore propose a One-Time-Password (OTP) authentication scheme, Glass OTP that uses the Glass camera to scan a QR code displayed on the user's smartphone. We implement a proof of concept Glass lock screen which unlocks only upon scanning an OTP generated by the companion Android smartphone application. We also discuss the reliability, security, and convenience of the proposed solution as compared to the current solutions in use.