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 "secure and privacy preserving data aggregation protocols for wireless sensor networks"):
  Abstract: This chapter discusses the need of security and privacy protection mechanisms in aggregation protocols used in wireless sensor networks (WSN). It presents a comprehensive state of the art discussion on the various privacy protection mechanisms used in WSNs and particularly focuses on the CPDA protocols proposed by He et al. (INFOCOM 2007). It identifies a security vulnerability in the CPDA protocol and proposes a mechanism to plug that vulnerability. To demonstrate the need of security in aggregation process, the chapter further presents various threats in WSN aggregation mechanisms. A large number of existing protocols for secure aggregation in WSN are discussed briefly and a protocol is proposed for secure aggregation which can detect false data injected by malicious nodes in a WSN. The performance of the protocol is also presented. The chapter concludes while highlighting some future directions of research in secure data aggregation in WSNs.

Includes members:
  Member "an attack on privacy preserving data aggregation protocol for wireless sensor networks":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "homomorphic encryption theory and application")
  Member "reputation and trust based systems for wireless self organizing networks":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "homomorphic encryption theory and application")
  Member "internet of things applications and challenges in technology and standardization":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "machine learning for resource management in cellular and iot networks potentials current solutions and open challenges")
  Member "a robust and secure aggregation protocol for wireless sensor networks":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "homomorphic encryption theory and application")
  Member "a trust based detection algorithm of selfish packet dropping nodes in a peer to peer wireless mesh network":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "secure and energy efficient data aggregation in wireless sensor networks")
  Member "a survey on wireless sensor network security":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "securing cluster heads in wireless sensor networks by a hybrid intrusion detection system based on data mining")
  Member "a distributed trust and reputation framework for mobile ad hoc networks":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "homomorphic encryption theory and application")
  Member "medians and beyond new aggregation techniques for sensor networks":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "streaming algorithms for bin packing and vector scheduling")

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)