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 "current injection attack against the kljn secure key exchange"):
  Abstract: The Kirchhoff-law-Johnson-noise (KLJN) scheme is a statistical/physical secure key exchange system based on the laws of classical statistical physics to provide unconditional security. We used the LTSPICE industrial cable and circuit simulator to emulate one of the major active (invasive) attacks, the current injection attack, against the ideal and a practical KLJN system, respectively. We show that two security enhancement techniques, namely, the instantaneous voltage/current comparison method, and a simple privacy amplification scheme, independently and effectively eliminate the information leak and successfully preserve the system's unconditional security.

Includes members:
  Member "random resistor random temperature kirchhoff law johnson noise rrrt kljn key exchange":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")
  Member "comments on a new transient attack on the kish key distribution 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 "resource requirements and speed versus geometry of unconditionally secure physical key exchanges":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "cable capacitance attack against the kljn secure key exchange")
  Member "key exchange trust evaluation in peer to peer sensor networks with unconditionally secure key exchange":
    also connected through other hyperedges:
      (none)
  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-4 (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-5 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")
  Member "generalized kirchhoff law johnson noise kljn secure key exchange system using arbitrary resistors":
    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 "cable capacitance attack against the kljn secure key exchange":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "generalized dc loop current attack against the kljn secure key exchange scheme")

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)