AirAuth is a biometric authentication technique that uses in-air hand gestures to authenticate users tracked through a short-range depth sensor. Our method tracks multiple distinct points on the user’s hand simultaneously that act as a biometric to further enhance security. We describe the details of our mobile demonstrator that will give Interactivity attendees an opportunity to enroll and verify our system’s authentication method. We also wish to encourage users to design their own gestures for use with the system. Apart from engaging with the CHI community, a demonstration of AirAuth would also yield useful gesture data input by the attendees which we intend to use to further improve the prototype and, more importantly, make available publicly as a resource for further research into gesture-based user interfaces.