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: "a secure communication game with a relay helping the eavesdropper"
  Abstract: In this work, a four-terminal complex Gaussian network composed of a source, a destination, an eavesdropper, and a jammer relay is studied under two different set of assumptions: 1) The jammer relay does not hear the source transmission, and 2) The jammer relay is causally given the source message. In both cases, the jammer relay assists the eavesdropper and aims to decrease the achievable secrecy rates. The source, on the other hand, aims to increase it. To help the eavesdropper, the jammer relay can use pure relaying and/or send interference. Each of the problems is formulated as a two-player, noncooperative, zero-sum continuous game. Assuming Gaussian strategies at the source and the jammer relay in the first problem, the Nash equilibrium is found and shown to be achieved with mixed strategies in general. The optimal cumulative distribution functions (cdfs) for the source and the jammer relay that achieve the value of the game, which is the Nash equilibrium secrecy rate, are found. For the second problem, the Nash equilibrium solution is found and the results are compared to the case when the jammer relay is not informed about the source message.

Connected through hyperedge HE-1 (induced by source paper "on the security analysis of a cooperative incremental relaying protocol in the presence of an active eavesdropper"):
  with members:
    - "power allocation and cooperative diversity in two way non regenerative cognitive radio networks"
    - "security versus reliability analysis of opportunistic relaying"
    - "opportunistic secrecy with a strict delay constraint"
    - "intercept probability analysis of cooperative wireless networks with best relay selection in the presence of eavesdropping attack"
    - "on the design of artificial noise aided secure multi antenna transmission in slow fading channels"
    - "three receiver broadcast channels with side information"
    - "joint relay and jammer selection for secure two way relay networks"
    - "buffers improve the performance of relay selection"

Connected through hyperedge HE-2 (induced by source paper "a reputation based stackelberg game model to enhance secrecy rate in spectrum leasing to selfish iot devices"):
  with members:
    - "spectrum sharing in cooperative cognitive radio networks a matching game framework"
    - "cooperation with an untrusted relay a secrecy perspective"

Connected through hyperedge HE-3 (induced by source paper "mimo secret communications against an active eavesdropper"):
  with members:
    - "secure degrees of freedom regions of multiple access and interference channels the polytope structure"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "improving wireless physical layer security via exploiting co channel interference"
    - "secure massive mimo transmission with an active eavesdropper"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "secure massive mimo transmission in the presence of an active eavesdropper"
    - "secure degrees of freedom of one hop wireless networks"
    - "improving physical layer secrecy using full duplex jamming receivers"

Connected through hyperedge HE-4 (induced by source paper "wireless information surveillance via proactive eavesdropping with spoofing relay"):
  with members:
    - "proactive eavesdropping via cognitive jamming in fading channels"
    - "active eavesdropping via spoofing relay attack"
    - "proactive eavesdropping via jamming for rate maximization over rayleigh fading channels"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "in band full duplex wireless challenges and opportunities"
    - "wireless information and power transfer architecture design and rate energy tradeoff"
    - "mimo broadcasting for simultaneous wireless information and power transfer"
    - "cooperation with an untrusted relay a secrecy perspective"

Connected through hyperedge HE-5 (induced by source paper "secure m psk communication via directional modulation"):
  with members:
    - "joint power control in wiretap interference channels"
    - "secrecy analysis on network coding in bidirectional multibeam satellite communications"
    - "constructive multiuser interference in symbol level precoding for the miso downlink channel"
    - "exploiting known interference as green signal power for downlink beamforming optimization"
    - "on secrecy rate analysis of mimo wiretap channels driven by finite alphabet input"

Connected through hyperedge HE-6 (induced by source paper "secrecy analysis on network coding in bidirectional multibeam satellite communications"):
  with members:
    - "secure communication over parallel relay channel"
    - "interference alignment for secrecy"
    - "joint relay and jammer selection for secure two way relay networks"
    - "secure satellite communication systems design with individual secrecy rate constraints"
    - "physical layer security combining error control coding and cryptography"

Connected through hyperedge HE-7 (induced by source paper "jamming games in the mimo wiretap channel with an active eavesdropper"):
  with members:
    - "robust beamforming for security in mimo wiretap channels with imperfect csi"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"
    - "half duplex active eavesdropping in fast fading channels a block markov wyner secrecy encoding scheme"
    - "spectrum sensing algorithms for cognitive radio based on statistical covariances"
    - "the secrecy capacity of the mimo wiretap channel"
    - "mutual information games in multi user channels with correlated jamming"

Connected through hyperedge HE-8 (induced by source paper "cooperative compute and forward"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "phase precoding for the compute and forward protocol"
    - "structured lattice codes for some two user gaussian networks with cognition coordination and two hops"
    - "the approximate sum capacity of the symmetric gaussian k user interference channel"
    - "asynchronous physical layer network coding"
    - "compute and forward strategies for cooperative distributed antenna systems"
    - "wireless network information flow a deterministic approach"
    - "reliable physical layer network coding"

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)