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: "secrecy capacity region of a multi antenna gaussian broadcast channel with confidential messages"
  Abstract: In wireless data networks, communication is particularly susceptible to eavesdropping due to its broadcast nature. Security and privacy systems have become critical for wireless providers and enterprise networks. This paper considers the problem of secret communication over the Gaussian broadcast channel, where a multi-antenna transmitter sends independent confidential messages to two users with information-theoretic secrecy. That is, each user would like to obtain its own confidential message in a reliable and safe manner. This communication model is referred to as the multi-antenna Gaussian broadcast channel with confidential messages (MGBC-CM). Under this communication scenario, a secret dirty-paper coding scheme and the corresponding achievable secrecy rate region are first developed based on Gaussian codebooks. Next, a computable Sato-type outer bound on the secrecy capacity region is provided for the MGBC-CM. Furthermore, the Sato-type outer bound prove to be consistent with the boundary of the secret dirty-paper coding achievable rate region, and hence, the secrecy capacity region of the MGBC-CM is established. Finally, two numerical examples demonstrate that both users can achieve positive rates simultaneously under the information-theoretic secrecy requirement.

Connected through hyperedge HE-1 (induced by source paper "secrecy sum rates with regularized channel inversion precoding under imperfect csi at the transmitter"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "secrecy sum rates for multi user mimo regularized channel inversion precoding"
    - "large system analysis of linear precoding in correlated miso broadcast channels under limited feedback"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "what is the value of joint processing of pilots and data in block fading channels"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "multiuser mimo achievable rates with downlink training and channel state feedback"
    - "mimo broadcast channels with finite rate feedback"

Connected through hyperedge HE-2 (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-3 (induced by source paper "collaborative relay beamforming for secrecy"):
  with members:
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "secure communication in the low snr regime a characterization of the energy secrecy tradeoff"
    - "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"
    - "on the secrecy capacity of fading channels"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-4 (induced by source paper "relay beamforming strategies for physical layer security"):
  with members:
    - "collaborative relay beamforming for secrecy"
    - "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"
    - "secure communication over fading channels"
    - "on the secrecy capacity of fading channels"

Connected through hyperedge HE-5 (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"
    - "a note on the secrecy capacity of the multi antenna wiretap channel"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-6 (induced by source paper "collaborative relay beamforming for secure broadcasting"):
  with members:
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "on the secrecy capacity of fading channels"

Connected through hyperedge HE-7 (induced by source paper "on the compound mimo broadcast channels with confidential messages"):
  with members:
    - "secured communication over frequency selective fading channels a practical vandermonde precoding"
    - "capacity bounds for broadcast channels with confidential messages"
    - "on the secrecy capacity of fading channels"

Connected through hyperedge HE-8 (induced by source paper "the secrecy capacity of the mimo wiretap channel"):
  with members:
    - "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"
    - "secure communication over fading channels"
    - "a note on the secrecy capacity of the multi antenna wiretap channel"
    - "the mimome channel"
    - "multiple antenna secure broadcast over wireless networks"
    - "an extremal inequality motivated by multiterminal information theoretic problems"
    - "on the secrecy capacity of fading 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)