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Secure Pick Up: Implicit authentication when you start using the smartphone

Author(s): Lee, W-H; Liu, X; Shen, Y; Jin, H; Lee, Ruby B

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Abstract: We propose Secure Pick Up (SPU), a convenient, lightweight, indevice, non-intrusive and automatic-learning system for smartphone user authentication. Operating in the background, our system implicitly observes users' phone pick-up movements, the way they bend their arms when they pick up a smartphone to interact with the device, to authenticate the users. Our SPU outperforms the state-of-the-art implicit authentication mechanisms in three main aspects: 1) SPU automatically learns the user's behavioral pattern without requiring a large amount of training data (especially those of other users) as previous methods did, making it more deployable. Towards this end, we propose a weighted multi-dimensional Dynamic Time Warping (DTW) algorithm to effectively quantify similarities between users' pick-up movements; 2) SPU does not rely on a remote server for providing further computational power, making SPU efficient and usable even without network access; and 3) our system can adaptively update a user's authentication model to accommodate user's behavioral drift over time with negligible overhead. Through extensive experiments on real world datasets, we demonstrate that SPU can achieve authentication accuracy up to 96.3% with a very low latency of 2.4 milliseconds. It reduces the number of times a user has to do explicit authentication by 32.9%, while effectively defending against various attacks.
Publication Date: 21-Jun-2017
Citation: Lee, W-H, Liu, X, Shen, Y, Jin, H, Lee, RB. (2017). Secure Pick Up: Implicit authentication when you start using the smartphone. Part F128644 (67 - 78. doi:10.1145/3078861.3078870
DOI: doi:10.1145/3078861.3078870
Pages: 67 - 78
Type of Material: Conference Article
Journal/Proceeding Title: Proceedings of ACM Symposium on Access Control Models and Technologies, SACMAT
Version: Author's manuscript

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