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 "key exchange trust evaluation in peer to peer sensor networks with unconditionally secure key exchange"):
  Abstract: As the utilization of sensor networks continue to increase, the importance of security becomes more profound. Many industries depend on sensor networks for critical tasks, and a malicious entity can potentially cause catastrophic damage. We propose a new key exchange trust evaluation for peer-to-peer sensor networks, where part of the network has unconditionally secure key exchange. For a given sensor, the higher the portion of channels with unconditionally secure key exchange the higher the trust value. We give a brief introduction to unconditionally secured key exchange concepts and mention current trust measures in sensor networks. We demonstrate the new key exchange trust measure on a hypothetical sensor network using both wired and wireless communication channels.

Includes members:
  Member "resource requirements and speed versus geometry of unconditionally secure physical key exchanges":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "current injection attack against the kljn secure key exchange")
  Member "analysis of an attenuator artifact in an experimental attack by gunn allison abbott against the kirchhoff law johnson noise kljn secure key exchange system":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")
  Member "on kljn based secure key distribution in vehicular communication networks":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")
  Member "enhanced usage of keys obtained by physical unconditionally secure distributions":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "current injection attack against the kljn secure key exchange")
  Member "what kind of noise guarantees security for the kirchhoff law johnson noise key exchange":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "random resistor random temperature kirchhoff law johnson noise rrrt kljn key exchange")
  Member "on the security of the kirchhoff law johnson noise kljn communicator":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")
  Member "securing vehicle communication systems by the kljn key exchange protocol":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")
  Member "noise properties in the ideal kirchhoff law johnson noise secure communication system":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "random resistor random temperature kirchhoff law johnson noise rrrt kljn key exchange")

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)