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: "half duplex active eavesdropping in fast fading channels a block markov wyner secrecy encoding scheme"
  Abstract: In this paper we study the problem of half-duplex active eavesdropping in fast fading channels. The active eavesdropper is a more powerful adversary than the classical eavesdropper. It can choose between two functional modes: eavesdropping the transmission between the legitimate parties (Ex mode), and jamming it (Jx mode) -- the active eavesdropper cannot function in full duplex mode. We consider a conservative scenario, when the active eavesdropper can choose its strategy based on the legitimate transmitter-receiver pair's strategy -- and thus the transmitter and legitimate receiver have to plan for the worst. We show that conventional physical-layer secrecy approaches perform poorly (if at all), and we introduce a novel encoding scheme, based on very limited and unsecured feedback -- the Block-Markov Wyner (BMW) encoding scheme -- which outperforms any schemes currently available.

Connected through hyperedge HE-1 (induced by source paper "qos aware stochastic spatial pls model for analysing secrecy performance under eavesdropping and jamming"):
  with members:
    - "coexistence of rf powered iot and a primary wireless network with secrecy guard zones"
    - "physical layer security for spectrum sharing systems"
    - "on phase noise suppression in full duplex systems"
    - "distance distributions in finite uniformly random networks theory and applications"

Connected through hyperedge HE-2 (induced by source paper "jamming assisted eavesdropping over parallel fading channels"):
  with members:
    - "multi antenna wireless legitimate surveillance systems design and performance analysis"
    - "proactive eavesdropping via jamming over harq based communications"
    - "surveillance and intervention of infrastructure free mobile communications a new wireless security paradigm"
    - "wireless information surveillance via proactive eavesdropping with spoofing relay"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "proactive eavesdropping via cognitive jamming in fading channels"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "proactive eavesdropping via jamming for rate maximization over rayleigh fading channels"

Connected through hyperedge HE-3 (induced by source paper "cell free massive mimo networks optimal power control against active eavesdropping"):
  with members:
    - "on the total energy efficiency of cell free massive mimo"
    - "mimo beamforming for secure and energy efficient wireless communication"
    - "energy efficiency in cell free massive mimo with zero forcing precoding design"
    - "mimo secret communications against an active eavesdropper"
    - "cell free massive mimo versus small cells"
    - "cell free massive mimo uniformly great service for everyone"
    - "secure massive mimo transmission with an active eavesdropper"
    - "secret key agreement with large antenna arrays under the pilot contamination attack"

Connected through hyperedge HE-4 (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-5 (induced by source paper "proactive eavesdropping via jamming for rate maximization over rayleigh fading channels"):
  with members:
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "jamming games in the mimo wiretap channel with an active eavesdropper"

Connected through hyperedge HE-6 (induced by source paper "jamming games in the mimo wiretap channel with an active eavesdropper"):
  with members:
    - "a secure communication game with a relay helping the eavesdropper"
    - "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"
    - "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-7 (induced by source paper "to obtain or not to obtain csi in the presence of hybrid adversary"):
  with members:
    - "jamming games in the mimo wiretap channel with an active eavesdropper"
    - "keys through arq theory and practice"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"
    - "secure communication over fading channels"
    - "on the secrecy capacity of fading channels"

Connected through hyperedge HE-8 (induced by source paper "on the secrecy capacity of block fading channels with a hybrid adversary"):
  with members:
    - "jamming games in the mimo wiretap channel with an active eavesdropper"
    - "on the throughput of secure hybrid arq protocols for gaussian block 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)