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Title: DCUS : evaluating double-click-based unlocking scheme on smartphones
Authors: Li, WJ 
Wang, Y
Tan, J
Zhu, N
Issue Date: Feb-2022
Source: Mobile networks and applications, Feb. 2022, v. 27, no. 1, p. 382-391
Abstract: With the increasing capability of software and hardware, mobile devices especially smartphones are changing the way of peoples’ communication and living styles. For the sake of convenience, people often store a lot of personal data like images on the device and use it for completing sensitive tasks like payment and financial transfer. This makes data protection more important on smartphones. To secure the device from unauthorized access, one simple and efficient method is to design a device or screen unlock mechanism, which can authenticate the identity of current user. However, most existing unlock schemes can be compromised if an attacker gets the correct pattern. In this work, we advocate that behavioral biometrics can be useful to improve the security of unlock mechanisms. We thus design DCUS, a double-click-based unlocking scheme on smartphones, which requires users to unlock the device by double clicking on the right location on an image. For user authentication, our scheme needs to check the selected images, image location and double-click patterns. In the evaluation, we perform a user study with 60 participants and make a comparison between our scheme and a similar unlock scheme. With several typical supervised classifiers, it is found that participants can perform well under our scheme.
Keywords: User authentication
Double click
Smartphone security
Behavioral authentication
Touch dynamics
Publisher: Springer
Journal: Mobile networks and applications 
ISSN: 1383-469X
EISSN: 1572-8153
DOI: 10.1007/s11036-021-01842-1
Rights: © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2021
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use (, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at:
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