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 note on the secrecy capacity of the multi antenna wiretap channel"
  Abstract: Recently, the secrecy capacity of the multi-antenna wiretap channel was characterized by Khisti and Wornell [1] using a Sato-like argument. This note presents an alternative characterization using a channel enhancement argument. This characterization relies on an extremal entropy inequality recently proved in the context of multi-antenna broadcast channels, and is directly built on the physical intuition regarding to the optimal transmission strategy in this communication scenario.

Connected through hyperedge HE-1 (induced by source paper "on the secrecy rate region of a fading multiple antenna gaussian broadcast channel with confidential messages and partial csit"):
  with members:
    - "on secrecy capacity of fast fading multiple input wiretap channels with statistical csit"
    - "cognitive radio with partial channel state information at the transmitter"
    - "on ergodic secrecy capacity for gaussian miso wiretap 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"
    - "transmitter optimization for achieving secrecy capacity in gaussian mimo wiretap channels"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "secure communication over fading channels"

Connected through hyperedge HE-2 (induced by source paper "on secrecy rate of the generalized artificial noise assisted secure beamforming for wiretap channels"):
  with members:
    - "on secrecy capacity of fast fading multiple input wiretap channels with statistical csit"
    - "on secrecy rate analysis of mimo wiretap channels driven by finite alphabet input"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"
    - "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"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-3 (induced by source paper "techniques for enhanced physical layer security"):
  with members:
    - "continuum percolation in the intrinsically secure communications graph"
    - "secure communication in stochastic wireless networks"
    - "on the relationship between the multi antenna secrecy communications and cognitive radio communications"
    - "on secrecy capacity scaling in wireless networks"
    - "secrecy in cooperative relay broadcast channels"
    - "the secrecy graph and some of its properties"
    - "secure communication over fading channels"
    - "secure nested codes for type ii wiretap channels"

Connected through hyperedge HE-4 (induced by source paper "mimo gaussian broadcast channels with confidential and common messages"):
  with members:
    - "multiple input multiple output gaussian broadcast channels with common and confidential messages"
    - "capacity bounds for broadcast channels with confidential messages"
    - "multiple input multiple output gaussian broadcast channels with confidential messages"
    - "the secrecy capacity of the mimo wiretap channel"
    - "secrecy capacity region of a multi antenna gaussian broadcast channel with confidential messages"

Connected through hyperedge HE-5 (induced by source paper "secured communication over frequency selective fading channels a practical vandermonde precoding"):
  with members:
    - "interference alignment for secrecy"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "on the 3 receiver broadcast channel with degraded message sets and confidential messages"
    - "the secrecy capacity region of the gaussian mimo broadcast channel"
    - "the k receiver broadcast channel with confidential messages"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "secrecy capacity of a class of broadcast channels with an eavesdropper"

Connected through hyperedge HE-6 (induced by source paper "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"):
  with members:
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "the mimome channel"
    - "multiple antenna secure broadcast over wireless networks"
    - "the secrecy capacity of the mimo wiretap channel"
    - "multiple access channels with generalized feedback and confidential messages"
    - "the discrete memoryless multiple access channel with confidential messages"
    - "achievable rates for the general gaussian multiple access wire tap channel with collective secrecy"

Connected through hyperedge HE-7 (induced by source paper "on the relationship between the multi antenna secrecy communications and cognitive radio communications"):
  with members:
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "exploiting multi antennas for opportunistic spectrum sharing in cognitive radio networks"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "multi antenna gaussian broadcast channels with confidential messages"
    - "weighted sum rate optimization for cognitive radio mimo broadcast channels"
    - "secrecy capacity region of fading broadcast channels"
    - "the secrecy capacity of the mimo wiretap channel"
    - "cognitive interference channels with confidential messages"

Connected through hyperedge HE-8 (induced by source paper "secrecy capacity of a class of orthogonal relay eavesdropper channels"):
  with members:
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "secure communication over fading channels"
    - "the mimome channel"
    - "the secrecy capacity of the mimo wiretap channel"
    - "the general gaussian multiple access and two way wire tap channels achievable rates and cooperative jamming"
    - "the relay eavesdropper channel cooperation for secrecy"
    - "relay channels with confidential messages"

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)