On the Security of Ultrasound as Out-of-band Channel

TitleOn the Security of Ultrasound as Out-of-band Channel
Publication TypeConference Paper
Year of Publication2007
AuthorsMayrhofer, R., & Gellersen H.
Conference NameProc. {IPDPS 2007}: 21st {IEEE} International Parallel and Distributed Processing Symposium
Date PublishedMarch
PublisherIEEE CS Press
Conference LocationWashington, DC, USA
ISBN Number1-4244-0909-8

Ultrasound has been proposed as out-of-band channel for authentication of peer devices in wireless ad hoc networks. Ultrasound can implicitly contribute to secure communication based on inherent limitations in signal propagation, and can additionally be used explicitly by peers to measure and verify their relative positions. In this paper we analyse potential attacks on an ultrasonic communication channel and peer-to-peer ultrasonic sensing, and investigate how potential attacks translate to application-level threats for peers seeking to establish a secure wireless link. Based on our analysis we propose a novel method for authentic communication of short messages over an ultrasonic channel.