InaudibleKey

Abstract

Secure Device-to-Device (D2D) communication is becoming increasingly\nimportant with the ever-growing number of Internet-of-Things (IoT) devices in\nour daily life. To achieve secure D2D communication, the key agreement between\ndifferent IoT devices without any prior knowledge is becoming desirable.\nAlthough various approaches have been proposed in the literature, they suffer\nfrom a number of limitations, such as low key generation rate and short pairing\ndistance. In this paper, we present InaudibleKey, an inaudible acoustic\nsignal-based key generation protocol for mobile devices. Based on acoustic\nchannel reciprocity, InaudibleKey exploits the acoustic channel frequency\nresponse of two legitimate devices as a common secret to generating keys.\nInaudibleKey employs several novel technologies to significantly improve its\nperformance. We conduct extensive experiments to evaluate the proposed system\nin different real environments. Compared to state-of-the-art works,\nInaudibleKey improves key generation rate by 3-145 times, extends pairing\ndistance by 3.2-44 times, and reduces information reconciliation counts by\n2.5-16 times. Security analysis demonstrates that InaudibleKey is resilient to\na number of malicious attacks. We also implement InaudibleKey on modern\nsmartphones and resource-limited IoT devices. Results show that it is\nenergy-efficient and can run on both powerful and resource-limited IoT devices\nwithout incurring excessive resource consumption.\n