Jive: spatially-constrained encryption key sharing using visible light communication

This paper investigates a novel encryption key sharing mechanism using the emerging wireless technology Visible Light Communication (VLC). Based on the idea of transmitting data by modulating light, we are able to (1) share a secret key within a constrained physical space and (2) communicate encrypted information among co-located mobile devices using the shared key. We present the demonstration Jive (Joint Integration of VLC and Encryption), a framework to support secret key sharing over Visible Light Communication. In defining Jive, we tackle challenges related to data encoding, message synchronization, and environmental noise to build a reliable, low complexity system using off-the shelf hardware. Our system is capable of sending encryption keys at speeds of more than 750bps using ultra short, high speed light pulses imperceptible to the human eye. Additionally, we have developed an application for Android that interfaces with the VLC device through serial communication so that applications running on mobile devices can subsequently use the keys to encrypt application data. Experimental results illustrate the high accuracy of our system across a variety of different variables. Finally, we position our system for use by a variety of applications that require a high-level of data security among physically co-located devices.