human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "sensor based continuous authentication of smartphones users using behavioral biometrics a survey"):
  Abstract: Mobile devices and technologies have become increasingly popular, offering comparable storage and computational capabilities to desktop computers allowing users to store and interact with sensitive and private information. The security and protection of such personal information are becoming more and more important since mobile devices are vulnerable to unauthorized access or theft. User authentication is a task of paramount importance that grants access to legitimate users at the point-of-entry and continuously through the usage session. This task is made possible with today's smartphones' embedded sensors that enable continuous and implicit user authentication by capturing behavioral biometrics and traits. In this paper, we survey more than 140 recent behavioral biometric-based approaches for continuous user authentication, including motion-based methods (27 studies), gait-based methods (23 studies), keystroke dynamics-based methods (20 studies), touch gesture-based methods (29 studies), voice-based methods (16 studies), and multimodal-based methods (33 studies). The survey provides an overview of the current state-of-the-art approaches for continuous user authentication using behavioral biometrics captured by smartphones' embedded sensors, including insights and open challenges for adoption, usability, and performance.

Includes members:
  Member "multilock mobile active authentication based on multiple biometric and behavioral patterns":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "be captcha detecting human behavior in smartphone interaction using multiple inbuilt sensors")
  Member "authentication of smartphone users using behavioral biometrics":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "programmable in network security for context aware byod policies")
  Member "implicit smartphone user authentication with sensors and contextual machine learning":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "smartphone impostor detection with built in sensors and deep learning")
  Member "multi sensor authentication to improve smartphone security":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "deeprotect enabling inference based access control on mobile sensing applications")
  Member "hmog new behavioral biometric features for continuous authentication of smartphone users":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "a report on personally identifiable sensor data from smartphone devices")
  Member "data driven authentication on the effectiveness of user behaviour modelling with mobile device sensors":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "a report on personally identifiable sensor data from smartphone devices")
  Member "secure voice based authentication for mobile devices vaulted voice verification":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "caliper continuous authentication layered with integrated pki encoding recognition")

Question: Please tell me which class the source paper belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CR(Cryptography and Security)