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: "cooperative secret communication with artificial noise in symmetric interference channel"
  Abstract: We consider the symmetric Gaussian interference channel where two users try to enhance their secrecy rates in a cooperative manner. Artificial noise is introduced along with useful information. We derive the power control and artificial noise parameter for two kinds of optimal points, max-min point and single user point. It is shown that there exists a critical value Pc of the power constraint, below which the max-min point is an optimal point on the secrecy rate region, and above which time-sharing between single user points achieves larger secrecy rate pairs. It is also shown that artificial noise can help to enlarge the secrecy rate region, in particular on the single user point.

Connected through hyperedge HE-1 (induced by source paper "improving wireless physical layer security via exploiting co channel interference"):
  with members:
    - "joint power control in wiretap interference channels"
    - "secrecy transmit beamforming for heterogeneous networks"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "mobile jammers for secrecy rate maximization in cooperative networks"
    - "secure degrees of freedom of k user gaussian interference channels a unified view"
    - "multiuser diversity for secrecy communications using opportunistic jammer selection secure dof and jammer scaling law"
    - "mimo interference alignment over correlated channels with imperfect csi"
    - "interference alignment for secrecy"

Connected through hyperedge HE-2 (induced by source paper "joint power control in wiretap interference channels"):
  with members:
    - "secure degrees of freedom of one hop wireless networks"
    - "secrecy in the 2 user symmetric deterministic interference channel with transmitter cooperation"
    - "outage constrained robust secure transmission for miso wiretap channels"
    - "spectrum leasing via cooperation for enhanced physical layer secrecy"
    - "interference assisted secret communication"
    - "the gaussian many to one interference channel with confidential messages"
    - "on the relationship between the multi antenna secrecy communications and cognitive radio communications"
    - "on the secrecy rate of interference networks using structured codes"

Connected through hyperedge HE-3 (induced by source paper "energy harvesting for secure ofdma systems"):
  with members:
    - "simultaneous information and power transfer for broadband wireless systems"
    - "wireless information and power transfer in multiuser ofdm systems"
    - "wireless information and power transfer energy efficiency optimization in ofdma systems"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "qos aware transmission policies for ofdm bidirectional decode and forward relaying"
    - "wireless information transfer with opportunistic energy harvesting"
    - "on the transfer of information and energy in multi user systems"
    - "resource allocation with subcarrier pairing in ofdma two way relay networks"

Connected through hyperedge HE-4 (induced by source paper "multiuser diversity for secrecy communications using opportunistic jammer selection secure dof and jammer scaling law"):
  with members:
    - "on the achievable dof and user scaling law of opportunistic interference alignment in 3 transmitter mimo interference channels"
    - "random beamforming with heterogeneous users and selective feedback individual sum rate and individual scaling laws"
    - "multiuser diversity in interfering broadcast channels achievable degrees of freedom and user scaling law"
    - "interference alignment for secrecy"
    - "joint relay and jammer selection for secure two way relay networks"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "ergodic secret alignment"
    - "ergodic interference alignment"

Connected through hyperedge HE-5 (induced by source paper "joint relay and jammer selection for secure two way relay networks"):
  with members:
    - "differential modulation for bi directional relaying with analog network coding"
    - "the role of feedback in two way secure communications"
    - "secrecy in cooperative relay broadcast channels"
    - "achievable rates for two way wire tap channels"
    - "achievable rates for the general gaussian multiple access wire tap channel with collective secrecy"
    - "the relay eavesdropper channel cooperation for secrecy"

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)