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: "what kind of noise guarantees security for the kirchhoff law johnson noise key exchange"
  Abstract: This paper is a supplement to our recent one about the analysis of the noise properties in the Kirchhoff-law–Johnson-noise (KLJN) secure key exchange system [Gingl and Mingesz, PLOS ONE 9 (2014) e96109, doi: 10.1371/journal.pone.0096109]. Here, we use purely mathematical statistical derivations to prove that only normal distribution with special scaling can guarantee security. Our results are in agreement with earlier physical assumptions [Kish, Phys. Lett. A 352 (2006) 178–182, doi: 10.1016/j.physleta.2005.11.062]. Furthermore, we have carried out numerical simulations to show that the communication is clearly unsecure for improper selection of the noise properties. Protection against attacks using time and correlation analysis is not considered in this paper. Related simulations are available at http://www.noise.inf.u-szeged.hu/Research/kljn/.

Connected through hyperedge HE-1 (induced by source paper "random resistor random temperature kirchhoff law johnson noise rrrt kljn key exchange"):
  with members:
    - "analysis of an attenuator artifact in an experimental attack by gunn allison abbott against the kirchhoff law johnson noise kljn secure key exchange system"
    - "generalized kirchhoff law johnson noise kljn secure key exchange system using arbitrary resistors"
    - "cable capacitance attack against the kljn secure key exchange"
    - "current and voltage based bit errors and their combined mitigation for the kirchhoff law johnson noise secure key exchange"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"
    - "elimination of a second law attack and all cable resistance based attacks in the kirchhoff law johnson noise kljn secure key exchange system"

Connected through hyperedge HE-2 (induced by source paper "resource requirements and speed versus geometry of unconditionally secure physical key exchanges"):
  with members:
    - "analysis of an attenuator artifact in an experimental attack by gunn allison abbott against the kirchhoff law johnson noise kljn secure key exchange system"
    - "on kljn based secure key distribution in vehicular communication networks"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "securing vehicle communication systems by the kljn key exchange protocol"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"
    - "elimination of a second law attack and all cable resistance based attacks in the kirchhoff law johnson noise kljn secure key exchange system"
    - "do electromagnetic waves exist in a short cable at low frequencies what does physics say"

Connected through hyperedge HE-3 (induced by source paper "key exchange trust evaluation in peer to peer sensor networks with unconditionally secure key exchange"):
  with members:
    - "resource requirements and speed versus geometry of unconditionally secure physical key exchanges"
    - "analysis of an attenuator artifact in an experimental attack by gunn allison abbott against the kirchhoff law johnson noise kljn secure key exchange system"
    - "on kljn based secure key distribution in vehicular communication networks"
    - "enhanced usage of keys obtained by physical unconditionally secure distributions"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "securing vehicle communication systems by the kljn key exchange protocol"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"

Connected through hyperedge HE-4 (induced by source paper "generalized kirchhoff law johnson noise kljn secure key exchange system using arbitrary resistors"):
  with members:
    - "analysis of an attenuator artifact in an experimental attack by gunn allison abbott against the kirchhoff law johnson noise kljn secure key exchange system"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "securing vehicle communication systems by the kljn key exchange protocol"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"
    - "elimination of a second law attack and all cable resistance based attacks in the kirchhoff law johnson noise kljn secure key exchange system"
    - "information theoretically secure enhanced johnson noise based key distribution over the smart grid with switched filters"
    - "enhanced secure key exchange systems based on the johnson noise scheme"

Connected through hyperedge HE-5 (induced by source paper "analysis of an attenuator artifact in an experimental attack by gunn allison abbott against the kirchhoff law johnson noise kljn secure key exchange system"):
  with members:
    - "current and voltage based bit errors and their combined mitigation for the kirchhoff law johnson noise secure key exchange"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"
    - "elimination of a second law attack and all cable resistance based attacks in the kirchhoff law johnson noise kljn secure key exchange system"
    - "do electromagnetic waves exist in a short cable at low frequencies what does physics say"
    - "critical analysis of the bennett riedel attack on secure cryptographic key distributions via the kirchhoff law johnson noise scheme"
    - "effective privacy amplification for secure classical communications"

Connected through hyperedge HE-6 (induced by source paper "facts myths and fights about the kljn classical physical key exchanger"):
  with members:
    - "current and voltage based bit errors and their combined mitigation for the kirchhoff law johnson noise secure key exchange"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"
    - "do electromagnetic waves exist in a short cable at low frequencies what does physics say"
    - "errors and their mitigation at the kirchhoff law johnson noise secure key exchange"
    - "enhanced secure key exchange systems based on the johnson noise scheme"
    - "critical analysis of the bennett riedel attack on secure cryptographic key distributions via the kirchhoff law johnson noise scheme"

Connected through hyperedge HE-7 (induced by source paper "elimination of a second law attack and all cable resistance based attacks in the kirchhoff law johnson noise kljn secure key exchange system"):
  with members:
    - "current and voltage based bit errors and their combined mitigation for the kirchhoff law johnson noise secure key exchange"
    - "on the security of the kirchhoff law johnson noise kljn communicator"
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"
    - "do electromagnetic waves exist in a short cable at low frequencies what does physics say"
    - "enhanced secure key exchange systems based on the johnson noise scheme"
    - "critical analysis of the bennett riedel attack on secure cryptographic key distributions via the kirchhoff law johnson noise scheme"
    - "effective privacy amplification for secure classical communications"

Connected through hyperedge HE-8 (induced by source paper "on the cracking scheme in the paper a directional coupler attack against the kish key distribution system by gunn allison and abbott"):
  with members:
    - "noise properties in the ideal kirchhoff law johnson noise secure communication system"
    - "do electromagnetic waves exist in a short cable at low frequencies what does physics say"
    - "a directional coupler attack against the kish key distribution system"
    - "enhanced secure key exchange systems based on the johnson noise scheme"
    - "critical analysis of the bennett riedel attack on secure cryptographic key distributions via the kirchhoff law johnson noise scheme"
    - "effective privacy amplification for secure classical communications"

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)