Double-X: Towards Double-Cross-Based Unlock Mechanism on Smartphones

Wenjuan Li, Jiao Tan, Nan Zhu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

6 Citations (Scopus)


Thanks to the convenience and the increasing functionalities, mobile devices especially smartphones are becoming an essential electronic device in people’s daily lives. Users can take the smartphone for online shopping and payment, as well as chatting with friends. However, with more private and sensitive information stored on such devices, how to secure the phone data becomes an open challenge. To protect a smartphone from unauthorized access, a direct and intuitive approach is to deploy an unlock mechanism, which requires users to input a correct pattern and unlock the phone. In the literature, combining behavioral biometrics can further enhance the security of unlock mechanisms, e.g., Android unlock patterns. In this work, we develop Double-X, a double-cross-based unlock scheme that requires users to unlock the phone by inputting two cross shapes on the selected dots. To authenticate the user, Double-X has to check the selected dots and the behavioral features when drawing the cross shapes. To examine the scheme performance, we perform two user studies with 80 participants with several typical supervised algorithms. The results indicate that participants can achieve a good success rate (e.g., 95%) under our scheme compared with two similar schemes.

Original languageEnglish
Title of host publicationICT Systems Security and Privacy Protection - 37th IFIP TC 11 International Conference, SEC 2022, Proceedings
EditorsWeizhi Meng, Simone Fischer-Hübner, Christian D. Jensen
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages17
ISBN (Print)9783031069741
Publication statusPublished - Jun 2022
Event37th IFIP International Conference on ICT Systems Security and Privacy Protection, SEC 2022 - Copenhagen, Denmark
Duration: 13 Jun 202215 Jun 2022

Publication series

NameIFIP Advances in Information and Communication Technology
Volume648 IFIP
ISSN (Print)1868-4238
ISSN (Electronic)1868-422X


Conference37th IFIP International Conference on ICT Systems Security and Privacy Protection, SEC 2022


  • Behavioral authentication
  • Double cross
  • Touch dynamics
  • Unlock mechanism
  • User authentication

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications
  • Information Systems and Management


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