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: "numerical study on secrecy capacity and code length dependence of the performances in optical wiretap channels"
  Abstract: Secrecy issues of free-space optical links realizing information theoretically secure communications and high transmission rates are discussed. We numerically study secrecy communication rates of optical wiretap channel based on on–off keying (OOK) modulation under typical conditions met in satellite-ground links. It is shown that, under reasonable degraded conditions on a wiretapper, information theoretically secure communications should be possible in a much wider distance range than a range limit of quantum key distribution, enabling secure optical links between geostationary Earth orbit satellites and ground stations with currently available technologies. We also provide the upper bounds on the decoding error probability and the leaked information to estimate a necessary code length for given required levels of performances. This result ensures that a reasonable length of wiretap channel code for our proposed scheme must exist.

Connected through hyperedge HE-1 (induced by source paper "two way physical layer security protocol for gaussian channels"):
  with members:
    - "semi finite length analysis for information theoretic tasks"
    - "a survey of physical layer security techniques for 5g wireless networks and challenges ahead"
    - "physical layer security for rf satellite channels in the finite length regime"
    - "wiretap channels nonasymptotic fundamental limits"
    - "quantum inspired secure wireless communication protocol under spatial and local gaussian noise assumptions"
    - "secure wireless communication under spatial and local gaussian noise assumptions"
    - "the wiretap channel with generalized feedback secure communication and key generation"
    - "secret key agreement general capacity and second order asymptotics"

Connected through hyperedge HE-2 (induced by source paper "physical layer security protocol for poisson channels for passive man in the middle attack"):
  with members:
    - "two way physical layer security protocol for gaussian channels"
    - "physical layer security for rf satellite channels in the finite length regime"
    - "signal detection under short interval sampling of continuous waveforms for optical wireless scattering communication"
    - "quantum inspired secure wireless communication protocol under spatial and local gaussian noise assumptions"
    - "secure wireless communication under spatial and local gaussian noise assumptions"
    - "5g wireless backhaul networks challenges and research advances"
    - "exponential decreasing rate of leaked information in universal random privacy amplification"
    - "strongly secure communications over the two way wiretap channel"

Connected through hyperedge HE-3 (induced by source paper "physical layer security for rf satellite channels in the finite length regime"):
  with members:
    - "two way physical layer security protocol for gaussian channels"
    - "free space optical channel estimation for physical layer security"
    - "secure multiplex coding with dependent and non uniform multiple messages"
    - "information theoretic physical layer security for satellite channels"
    - "empirical and strong coordination via soft covering with polar codes"
    - "quantum inspired secure wireless communication protocol under spatial and local gaussian noise assumptions"
    - "secure wireless communication under spatial and local gaussian noise assumptions"
    - "joint power control in wiretap interference channels"

Connected through hyperedge HE-4 (induced by source paper "secrecy outage analysis of mixed rf fso downlink swipt systems"):
  with members:
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-5 (induced by source paper "free space optical channel estimation for physical layer security"):
  with members:
    - "reliability and secrecy functions of the wiretap channel under cost constraint"
    - "exponential decreasing rate of leaked information in universal random privacy amplification"
    - "the secrecy capacity of the mimo wiretap channel"

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.IT(Information Theory)