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: "reputation and trust based systems for wireless self organizing networks"
  Abstract: Traditional approach of providing network security has been to borrow tools and mechanisms from cryptography. However, the conventional view of security based on cryptography alone is not sufficient for the defending against unique and novel types of misbehavior exhibited by nodes in wireless self-organizing networks such as mobile ad hoc networks and wireless sensor networks. Reputation-based frameworks, where nodes maintain reputation of other nodes and use it to evaluate their trustworthiness, are deployed to provide scalable, diverse and a generalized approach for countering different types of misbehavior resulting form malicious and selfish nodes in these networks. In this chapter, we present a comprehensive discussion on reputation and trust-based systems for wireless self-organizing networks. Different classes of reputation system are described along with their unique characteristics and working principles. A number of currently used reputation systems are critically reviewed and compared with respect to their effectiveness and efficiency of performance. Some open problems in the area of reputation and trust-based system within the domain of wireless self-organizing networks are also discussed.

Connected through hyperedge HE-1 (induced by source paper "homomorphic encryption theory and application"):
  with members:
    - "security in wireless sensor networks"
    - "security and privacy issues in wireless mesh networks a survey"
    - "an attack on privacy preserving data aggregation protocol for wireless sensor networks"
    - "secure and privacy preserving data aggregation protocols for wireless sensor networks"
    - "secure and privacy preserving authentication protocols for wireless mesh networks"
    - "a novel mechanism for detection of distributed denial of service attacks"
    - "a mechanism for detection of gray hole attack in mobile ad hoc networks"
    - "secure and privacy aware searching in peer to peer networks"

Connected through hyperedge HE-2 (induced by source paper "security and privacy issues in wireless mesh networks a survey"):
  with members:
    - "secure and privacy preserving authentication protocols for wireless mesh networks"
    - "secure and privacy aware searching in peer to peer networks"
    - "an efficient and user privacy preserving routing protocol for wireless mesh networks"
    - "a distributed protocol for detection of packet dropping attack in mobile ad hoc networks"
    - "cross layer protocols for multimedia communications over wireless networks"
    - "secure routing in wireless mesh networks"
    - "a survey on wireless sensor network security"
    - "a distributed trust management framework for detecting malicious packet dropping nodes in a mobile ad hoc network"

Connected through hyperedge HE-3 (induced by source paper "a survey on security and privacy protocols for cognitive wireless sensor networks"):
  with members:
    - "secure and privacy aware searching in peer to peer networks"
    - "a survey on wireless sensor network security"
    - "an intrusion detection architecture for clustered wireless ad hoc networks"
    - "routing security issues in wireless sensor networks attacks and defenses"

Connected through hyperedge HE-4 (induced by source paper "secure and privacy preserving data aggregation protocols for wireless sensor networks"):
  with members:
    - "an attack on privacy preserving data aggregation protocol for wireless sensor networks"
    - "internet of things applications and challenges in technology and standardization"
    - "a robust and secure aggregation protocol for wireless sensor networks"
    - "a trust based detection algorithm of selfish packet dropping nodes in a peer to peer wireless mesh network"
    - "a survey on wireless sensor network security"
    - "a distributed trust and reputation framework for mobile ad hoc networks"
    - "medians and beyond new aggregation techniques for sensor networks"

Connected through hyperedge HE-5 (induced by source paper "secure and energy efficient data aggregation in wireless sensor networks"):
  with members:
    - "a distributed protocol for detection of packet dropping attack in mobile ad hoc networks"
    - "a robust and secure aggregation protocol for wireless sensor networks"
    - "a trust based detection algorithm of selfish packet dropping nodes in a peer to peer wireless mesh network"
    - "a survey on wireless sensor network security"
    - "a distributed trust and reputation framework for mobile ad hoc networks"

Connected through hyperedge HE-6 (induced by source paper "secure and privacy preserving authentication protocols for wireless mesh networks"):
  with members:
    - "secure routing in wireless mesh networks"
    - "a survey on wireless sensor network security"
    - "a distributed trust and reputation framework for mobile ad hoc networks"
    - "a robust and efficient node authentication protocol for mobile ad hoc networks"

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)