human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "a multi factor security protocol for wireless payment secure web authentication using mobile devices"
  Abstract: Previous Web access authentication systems often use either the Web or the Mobile channel individually to confirm the claimed identity of the remote user. This paper proposes a new protocol using multifactor authentication system that is both secure and highly usable. It uses a novel approach based on Transaction Identification Code and SMS to enforce extra security level with the traditional Login/password system. The system provides a highly secure environment that is simple to use and deploy, that does not require any change in infrastructure or protocol of wireless networks. This Protocol for Wireless Payment is extended to provide two way authentications.

Connected through hyperedge HE-1 (induced by source paper "application of multi factor authentication in internet of things domain"):
  with members:
    - "detection and prevention of botnets and malware in an enterprise network"
    - "a multi dimensional approach towards intrusion detection system"
    - "embedding secret data in html web page"
    - "data hiding techniques using prime and natural numbers"
    - "voice recognition algorithms using mel frequency cepstral coefficient mfcc and dynamic time warping dtw techniques"
    - "a semi distributed reputation based intrusion detection system for mobile adhoc networks"

Connected through hyperedge HE-2 (induced by source paper "authentication systems in internet of things"):
  with members:
    - "ant colony based routing for mobile ad hoc networks towards improved quality of services"
    - "an lsb data hiding technique using natural number decomposition"

Connected through hyperedge HE-3 (induced by source paper "analysis of applicability of iso 9564 pin based authentication to closed loop mobile payment systems"):
  with members:
    - "mobile device identification via sensor fingerprinting"

Connected through hyperedge HE-4 (induced by source paper "a survey on security issues in ad hoc routing protocols and their mitigation techniques"):
  with members:
    - "rism reputation based intrusion detection system for mobile ad hoc networks"
    - "automatic firewall rules generator for anomaly detection systems with apriori algorithm"
    - "an lsb data hiding technique using prime numbers"
    - "a semi distributed reputation based intrusion detection system for mobile adhoc networks"
    - "a distributed trust and reputation framework for mobile ad hoc networks"

Connected through hyperedge HE-5 (induced by source paper "a hybrid approach towards intrusion detection based on artificial immune system and soft computing"):
  with members:
    - "detection and prevention of botnets and malware in an enterprise network"
    - "steganography and steganalysis different approaches"
    - "an lsb data hiding technique using prime numbers"
    - "a semi distributed reputation based intrusion detection system for mobile adhoc networks"

Connected through hyperedge HE-6 (induced by source paper "survey on security issues in cloud computing and associated mitigation techniques"):
  with members:
    - "a novel multipath approach to security in mobile ad hoc networks manets"
    - "a new trusted and collaborative agent based approach for ensuring cloud security"
    - "compchall addressing password guessing attacks"

Connected through hyperedge HE-7 (induced by source paper "fugeids fuzzy genetic paradigms in intrusion detection systems"):
  with members:
    - "steganography and steganalysis different approaches"
    - "security scheme for distributed dos in mobile ad hoc networks"

Connected through hyperedge HE-8 (induced by source paper "collusion resistant self healing key distribution in mobile wireless networks"):
  with members:
    - "a novel multipath approach to security in mobile ad hoc networks manets"
    - "an lsb data hiding technique using prime numbers"

Question: Please tell me which class the center node 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)