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: "secure communication in the low snr regime a characterization of the energy secrecy tradeoff"
  Abstract: Secrecy capacity of a multiple-antenna wiretap channel is studied in the low signal-to-noise ratio (SNR) regime. Expressions for the first and second derivatives of the secrecy capacity with respect to SNR at SNR = 0 are derived. Transmission strategies required to achieve these derivatives are identified. In particular, it is shown that it is optimal in the low-SNR regime to transmit in the maximum-eigenvalue eigenspace of H_m* H_m - N_m/N_e H_e* H_e where H_m and H_e denote the channel matrices associated with the legitimate receiver and eavesdropper, respectively, and N_m and N_e are the noise variances at the receiver and eavesdropper, respectively. Energy efficiency is analyzed by finding the minimum bit energy required for secure and reliable communications, and the wideband slope. Increased bit energy requirements under secrecy constraints are quantified. Finally, the impact of fading is investigated.

Connected through hyperedge HE-1 (induced by source paper "on the transmit beamforming for mimo wiretap channels large system analysis"):
  with members:
    - "on secrecy capacity of fast fading mimome wiretap channels with statistical csit"
    - "on secrecy capacity of fast fading multiple input wiretap channels with statistical csit"
    - "a deterministic equivalent for the analysis of correlated mimo multiple access channels"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "secret sharing over fast fading mimo wiretap channels"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-2 (induced by source paper "on secrecy rate analysis of mimo wiretap channels driven by finite alphabet input"):
  with members:
    - "estimation in gaussian noise properties of the minimum mean square error"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "the gaussian multiple access wire tap channel with collective secrecy constraints"
    - "mutual information and minimum mean square error in gaussian channels"

Connected through hyperedge HE-3 (induced by source paper "secure diversity multiplexing tradeoff of zero forcing transmit scheme at finite snr"):
  with members:
    - "error rates of the maximum likelihood detector for arbitrary constellations convex concave behavior and applications"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"
    - "diversity multiplexing tradeoff for the multiple antenna wire tap channel"
    - "log concavity property of the error probability with application to local bounds for wireless communications"
    - "impact of spatial correlation on the finite snr diversity multiplexing tradeoff"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-4 (induced by source paper "collaborative relay beamforming for secrecy"):
  with members:
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "on the relationship between the multi antenna secrecy communications and cognitive radio communications"
    - "secrecy capacity of a class of orthogonal relay eavesdropper channels"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "network beamforming using relays with perfect channel information"
    - "secrecy capacity region of a multi antenna gaussian broadcast channel with confidential messages"
    - "on the secrecy capacity of fading channels"
    - "applications of ldpc codes to the 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)