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: "the secrecy graph and some of its properties"
  Abstract: A new random geometric graph model, the so-called secrecy graph, is introduced and studied. The graph represents a wireless network and includes only edges over which secure communication in the presence of eavesdroppers is possible. The underlying point process models considered are lattices and Poisson point processes. In the lattice case, analogies to standard bond and site percolation can be exploited to determine percolation thresholds. In the Poisson case, the node degrees are determined and percolation is studied using analytical bounds and simulations. It turns out that a small density of eavesdroppers already has a drastic impact on the connectivity of the secrecy graph.

Connected through hyperedge HE-1 (induced by source paper "secure communication in dynamic wireless ad hoc networks"):
  with members:
    - "k connectivity in random key graphs with unreliable links"
    - "tradeoff between delay and physical layer security in wireless networks"
    - "directional cell search delay analysis for cellular networks with static users"
    - "toward a tractable delay analysis in ultra dense networks"
    - "connectivity in secure wireless sensor networks under transmission constraints"
    - "on topological properties of wireless sensor networks under the q composite key predistribution scheme with on off channels"
    - "physical layer security in cellular networks a stochastic geometry approach"
    - "on the throughput cost of physical layer security in decentralized wireless networks"

Connected through hyperedge HE-2 (induced by source paper "tradeoff between delay and physical layer security in wireless networks"):
  with members:
    - "when mmwave communications meet network densification a scalable interference coordination perspective"
    - "secure transmission with large numbers of antennas and finite alphabet inputs"
    - "5g software defined vehicular networks"
    - "toward a tractable delay analysis in ultra dense networks"
    - "heterogeneous cellular networks with spatio temporal traffic delay analysis and scheduling"
    - "secure massive mimo transmission with an active eavesdropper"
    - "5g ultra dense cellular networks"
    - "performance laws of large heterogeneous cellular networks"

Connected through hyperedge HE-3 (induced by source paper "on secure wireless communications for service oriented computing"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "on cooperative relaying schemes for wireless physical layer security"
    - "cooperative jamming for secure communications in mimo relay networks"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "a simple cooperative diversity method based on network path selection"

Connected through hyperedge HE-4 (induced by source paper "secrecy analysis of random mimo wireless networks over alpha mu fading channels"):
  with members:
    - "on secrecy performance of antenna selection aided mimo systems against eavesdropping"
    - "physical layer security in millimeter wave cellular networks"
    - "performance analysis for physical layer security in multi antenna downlink networks with limited csi feedback"
    - "a geometric interpretation of fading in wireless networks theory and applications"

Connected through hyperedge HE-5 (induced by source paper "boundaries as an enhancement technique for physical layer security"):
  with members:
    - "temporal correlation of interference and outage in mobile networks over one dimensional finite regions"
    - "stochastic geometry based comparison of secrecy enhancement techniques in d2d networks"
    - "temporal correlation of interference in bounded mobile ad hoc networks with blockage"
    - "distribution of cell size in bounded voronoi tesselations with application to secure local connectivity"
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "physical layer security in heterogeneous cellular networks"
    - "physical layer security in three tier wireless sensor networks a stochastic geometry approach"
    - "analyzing the impact of access point density on the performance of finite area networks"

Connected through hyperedge HE-6 (induced by source paper "boundaries can enhance physical layer security at high data rates"):
  with members:
    - "temporal correlation of interference and outage in mobile networks over one dimensional finite regions"
    - "physical layer security in wireless ad hoc networks under a hybrid full half duplex receiver deployment strategy"
    - "stochastic geometry based comparison of secrecy enhancement techniques in d2d networks"
    - "temporal correlation of interference in bounded mobile ad hoc networks with blockage"
    - "physical layer security in heterogeneous cellular networks"
    - "physical layer security in three tier wireless sensor networks a stochastic geometry approach"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "analyzing the impact of access point density on the performance of finite area networks"

Connected through hyperedge HE-7 (induced by source paper "on secure communication in sensor networks under q composite key predistribution with unreliable links"):
  with members:
    - "k connectivity in random key graphs with unreliable links"
    - "on resilience and connectivity of secure wireless sensor networks under node capture attacks"
    - "probabilistic key predistribution in mobile networks resilient to node capture attacks"
    - "on topological properties of wireless sensor networks under the q composite key predistribution scheme with on off channels"
    - "performance of the eschenauer gligor key distribution scheme under an on off channel"
    - "on the asymptotic connectivity of random networks under the random connection model"
    - "towards a better understanding of large scale network models"

Connected through hyperedge HE-8 (induced by source paper "securing visible light communication systems by beamforming in the presence of randomly distributed eavesdroppers"):
  with members:
    - "secrecy outage analysis for downlink transmissions in the presence of randomly located eavesdroppers"
    - "what will 5g be"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "on the capacity of free space optical intensity channels"

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)