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 "security in wireless sensor networks"):
  Abstract: Wireless sensor networks have attracted a lot of interest over the last decade in wireless and mobile computing research community. Applications of these networks are numerous and growing, which range from indoor deployment scenarios in the home and office to outdoor deployment in adversary's territory in a tactical battleground. However, due to distributed nature and their deployment in remote areas, these networks are vulnerable to numerous security threats that can adversely affect their performance. This chapter provides a comprehensive discussion on the state of the art in security technologies for wireless sensor networks. It identifies various possible attacks at different layers of the communication protocol stack in a typical sensor network and their possible countermeasures. A brief discussion on the future direction of research in WSN security is also included.

Includes members:
  Member "a mechanism for detection of gray hole attack in mobile ad hoc networks":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "homomorphic encryption theory and application")
  Member "secure and privacy aware searching in peer to peer networks":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "homomorphic encryption theory and application")
  Member "an efficient and user privacy preserving routing protocol for wireless mesh networks":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "homomorphic encryption theory and application")
  Member "a distributed protocol for detection of packet dropping attack in mobile ad hoc networks":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "homomorphic encryption theory and application")
  Member "a robust and secure aggregation protocol for wireless sensor networks":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "homomorphic encryption theory and application")
  Member "a distributed trust management framework for detecting malicious packet dropping nodes in a mobile ad hoc network":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "security and privacy issues in wireless mesh networks a survey")
  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)