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 and voltage based bit errors and their combined mitigation for the kirchhoff law johnson noise secure key exchange"):
  Abstract: We classify and analyze bit errors in the current measurement mode of the Kirchhoff-law---Johnson-noise (KLJN) key distribution. The error probability decays exponentially with increasing bit exchange period and fixed bandwidth, which is similar to the error probability decay in the voltage measurement mode. We also analyze the combination of voltage and current modes for error removal. In this combination method, the error probability is still an exponential function that decays with the duration of the bit exchange period, but it has superior fidelity to the former schemes.

Includes members:
  Member "information theoretically secure enhanced johnson noise based key distribution over the smart grid with switched filters":
    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 "physical uncloneable function hardware keys utilizing kirchhoff law johnson noise secure key exchange and noise based logic":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "cable capacitance attack against the kljn secure key exchange")
  Member "errors and their mitigation at the kirchhoff law johnson noise secure key exchange":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "a static loop current attack against the kljn secure key exchange system")
  Member "enhanced secure key exchange systems based on the johnson noise scheme":
    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 "critical analysis of the bennett riedel attack on secure cryptographic key distributions via the kirchhoff law johnson noise scheme":
    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 "information networks secured by the laws of physics":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "current injection attack against the kljn secure 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)