Secure Pick Up: Implicit Authentication When You Start Using the Smartphone
Wei-Han Lee, Xiaochen Liu, Yilin Shen, Hongxia Jin, Ruby B. Lee

TL;DR
Secure Pick Up (SPU) is a lightweight, in-device implicit authentication system for smartphones that learns user behavior from pick-up movements, achieving high accuracy and low latency without needing network access.
Contribution
The paper introduces SPU, a novel implicit authentication system that automatically learns user behavior with minimal training data and adapts over time, outperforming existing methods.
Findings
Authentication accuracy up to 96.3%
Reduces explicit authentication by 32.9%
Latency of 2.4 milliseconds
Abstract
We propose Secure Pick Up (SPU), a convenient, lightweight, in-device, 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…
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Taxonomy
TopicsUser Authentication and Security Systems · Innovative Human-Technology Interaction · Biometric Identification and Security
