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Open AccessArticle

AirSign: Smartphone Authentication by Signing in the Air

Department of Computer Science, Purdue University, West Lafayette, IN 47907, USA
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Author to whom correspondence should be addressed.
Sensors 2021, 21(1), 104; https://doi.org/10.3390/s21010104
Received: 24 November 2020 / Revised: 20 December 2020 / Accepted: 21 December 2020 / Published: 26 December 2020
(This article belongs to the Special Issue Smartphone-Based Sensors for Biometric Authentication)
In this paper, we propose AirSign, a novel user authentication technology to provide users with more convenient, intuitive, and secure ways of interacting with smartphones in daily settings. AirSign leverages both acoustic and motion sensors for user authentication by signing signatures in the air through smartphones without requiring any special hardware. This technology actively transmits inaudible acoustic signals from the earpiece speaker, receives echoes back through both built-in microphones to “illuminate” signature and hand geometry, and authenticates users according to the unique features extracted from echoes and motion sensors. To evaluate our system, we collected registered, genuine, and forged signatures from 30 participants, and by applying AirSign on the above dataset, we were able to successfully distinguish between genuine and forged signatures with a 97.1% F-score while requesting only seven signatures during the registration phase. View Full-Text
Keywords: security and privacy protection; biometrics; acoustic sensing; online signature authentication; machine learning security and privacy protection; biometrics; acoustic sensing; online signature authentication; machine learning
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MDPI and ACS Style

Shao, Y.; Yang, T.; Wang, H.; Ma, J. AirSign: Smartphone Authentication by Signing in the Air. Sensors 2021, 21, 104. https://doi.org/10.3390/s21010104

AMA Style

Shao Y, Yang T, Wang H, Ma J. AirSign: Smartphone Authentication by Signing in the Air. Sensors. 2021; 21(1):104. https://doi.org/10.3390/s21010104

Chicago/Turabian Style

Shao, Yubo; Yang, Tinghan; Wang, He; Ma, Jianzhu. 2021. "AirSign: Smartphone Authentication by Signing in the Air" Sensors 21, no. 1: 104. https://doi.org/10.3390/s21010104

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