A method for establishing proximity-based trust of nearby devices through audio communication is disclosed. The method includes a protocol for devices that communicate over audio within a predetermined distance from each other to verify proximity. A packet token is included at the end of each packet. After each packet ends broadcasting, the sending device listens for a response from the receiving device for a window of time corresponding to the time it takes for sound to make a round-trip through the predetermined distance. This mechanism could be used in mobile application development where applications are required to ensure co-presence within a specified distance from another device as a criterion for trust.
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Aristizabal, David and Liss, Adam, "ESTABLISHING PROXIMITY-BASED TRUST OF NEARBY DEVICES THROUGH AUDIO COMMUNICATION", Technical Disclosure Commons, (September 20, 2016)